{"id":25588,"date":"2022-09-06T00:00:00","date_gmt":"2022-09-06T00:00:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/zwei-faktor-authentifizierung-kontosicherheit\/"},"modified":"2026-09-22T13:42:45","modified_gmt":"2026-09-22T13:42:45","slug":"zwei-faktor-authentifizierung-kontosicherheit","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/de\/blog\/product\/zwei-faktor-authentifizierung-kontosicherheit\/","title":{"rendered":"Sicherheit geht vor: Entdecken Sie die Zwei-Faktor-Authentifizierung (2FA)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">It\u2019s that kind of Monday: You show up to work, and you\u2019ve been logged out of your Mailgun account. You input your password, and it prompts you to enter a verification code sent via SMS to your phone.<\/p>\n\n<p class=\"wp-block-paragraph\"><i>Please input the six-digit code we sent to +1 (xxx) &#8211; xxx &#8211; 8318 to access your account.<\/i><\/p>\n\n<p class=\"wp-block-paragraph\">Welcome to two-factor authentication, or 2FA for short. In this article, we\u2019ll go over what 2FA is, different authentication factors, and types of 2FA. Then we\u2019ll cover how to use two-factor authentication in your <a href=\"https:\/\/www.mailgun.com\/de\/blog\/email\/best-practices-fuer-e-mail-sicherheit\/\" target=\"_tabs\" rel=\"noopener noreferrer\">daily cybersecurity practices<\/a> and what to do if you need help with 2FA.<\/p>\n\r\n    <nav data-content-type=\"longform\" class=\"toc-block longform-spacings px-5 py-6 px-md-6 px-lg-7 py-md-7 bg-light fs-sm rounded-lg\" aria-labelledby=\"toc-title-6332\"><p class=\"h5 m-0\" id=\"toc-title-6332\">Inhaltsverzeichnis<\/p><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">01<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-is-two-factor-authentication-and-why-do-i-need-it\">What is two-factor authentication, and why do I need it?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">02<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-are-different-authentication-factors\">What are different authentication factors?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">03<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-are-the-types-of-2fa\">What are the types of 2FA?<\/a><a class=\"scrollme link-body-color\" href=\"#what-are-hardware-tokens\">What are hardware tokens?<\/a><a class=\"scrollme link-body-color\" href=\"#what-are-sms-verification-codes\">What are SMS verification codes?<\/a><a class=\"scrollme link-body-color\" href=\"#what-are-push-notifications\">What are push notifications?<\/a><a class=\"scrollme link-body-color\" href=\"#what-is-a-software-token\">What is a software token?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">04<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#how-do-you-use-2fa-with-mailgun\">How do you use 2FA with Mailgun?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">05<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-do-i-do-if-i-need-help-with-2fa-in-mailgun\">What do I do if I need help with 2FA in Mailgun?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">06<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#wrapping-up\">Wrapping up<\/a><\/div><\/div><\/nav>\n<h2 class=\"wp-block-heading\">What is two-factor authentication, and why do I need it?<\/h2>\n\n<p class=\"wp-block-paragraph\">2FA is a security system that requires two independent forms of identification to gain access to an account. This is useful for both account security and account recovery. Usually, the first form of security is your password to the account. The extra layer of security can rely on one of the following:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>A rotating, one-time password (OTP)<\/li>\n\n\n\n<li>A 6-digit authentication code<\/li>\n\n\n\n<li>A unique token<\/li>\n\n\n\n<li>A password or fingerprint confirmation via a second secure device (like a mobile device or a yubikey)<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">There are other methods, but these are the most common. The unique password or token is sent via email or text message to another trusted device, account, or phone number, and is required every time you attempt to log into your account. Anyone logging into your account will need to know your super-secret password AND access your 2FA code.<\/p>\n\n<p class=\"wp-block-paragraph\">2FA increases the security of your account and guards against cybersecurity threats like <a href=\"https:\/\/www.mailgun.com\/de\/blog\/it-and-engineering\/e-mail-gateway-schwachstellen\/\" target=\"_tabs\" rel=\"noopener noreferrer\">phishing<\/a>, key-logging, and other <a href=\"https:\/\/www.mailgun.com\/de\/blog\/deliverability\/spam-von-meinem-konto-gesendet-was-tun\/\" target=\"_tabs\" rel=\"noopener noreferrer\">attacks by hackers<\/a>. After all, you don\u2019t want to <a href=\"https:\/\/docs.google.com\/document\/u\/0\/d\/1UpyfW77Nfe4l5mRj8utX1b-m3piCy1ehuAUcT5Pa91g\/edit\" target=\"_tabs\" rel=\"noopener noreferrer\">send spam to your consumers<\/a> after being hacked. 2FA is just as important for you as a developer as it is for your users.<\/p>\n\n<p class=\"wp-block-paragraph\">According to an Insurance Information Institute report, consumers reported <a href=\"https:\/\/www.iii.org\/fact-statistic\/facts-statistics-identity-theft-and-cybercrime\" target=\"_tabs\" rel=\"noopener noreferrer\">losing more than $3.3 billion to fraud<\/a> in 2020. As cybersecurity threats become more prevalent, businesses are responsible for providing stringent account security for their websites and mobile apps.<\/p>\n\n<h2 class=\"wp-block-heading\">What are different authentication factors?<\/h2>\n\n<p class=\"wp-block-paragraph\">2FA relies on two separate authentication factors to verify your identity and grant you access to your account.<\/p>\n\n<p class=\"wp-block-paragraph\">Authentication factors are different categories of security credentials that can verify a user\u2019s identity and authorize access to a secured account. The most reliable authentication factors are:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><b>Knowledge factor: <\/b>This is an authentication credential based on the user having a specific piece of knowledge, like a password or personal identification number (PIN). Most generic (shared\/multi-user account) logins use a username or email with a password or PIN to authenticate the user.<\/li>\n\n\n\n<li><b>Possession factor: <\/b>This factor relies on the user possessing a device or way to access a piece of information, like a security key, to complete authentication procedures. For instance, in our example above, the user was instructed to input a six-digit code sent to a previously registered mobile device. This is an example of a possession factor, as the user must possess the registered phone to access the authentication code.<\/li>\n\n\n\n<li><b>Location factor: <\/b>This authentication factor relies on geolocation through internet protocol (IP) addresses or media access control (MAC) addresses. Network administrators will use this to check the user\u2019s location before allowing them access to a network, application, or system.<\/li>\n\n\n\n<li><b>Inherence factor: <\/b>This relies on factors unique to the user, like biometric credentials such as fingerprints or facial recognition, to grant access. A mobile app may ask you to enter your username and password and then ask for a face ID or a fingerprint as a secondary form of authentication before granting you access.<\/li>\n\n\n\n<li><b>Time factor: <\/b>This adds a time-based factor to authentication. For instance, a time factor can be a Time-based One-Time Password (TOTP) generated with a standardized algorithm and valid within a certain window of time. You\u2019ll likely receive this via SMS or email.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">What are the types of 2FA?<\/h2>\n\n<p class=\"wp-block-paragraph\">Now that we know the different authentication factors, let\u2019s look at some types of 2FA which employ the above factors.<\/p>\n\n<p class=\"wp-block-paragraph\">We\u2019ll look at:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Hardware tokens<\/li>\n\n\n\n<li>SMS verification codes<\/li>\n\n\n\n<li>Push notifications<\/li>\n\n\n\n<li>Software tokens<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">What are hardware tokens?<\/h3>\n\n<p class=\"wp-block-paragraph\">Hardware tokens are physical tokens, like a key fob or USB stick, that generate a new numeric code every 30 seconds or so. These tokens either display the code the user must manually input into their login page, or plug directly into a device\u2019s USB port.<\/p>\n\n<p class=\"wp-block-paragraph\">The downside to hardware tokens is that they\u2019re easy to lose and are costly for businesses to replace.<\/p>\n\n<h3 class=\"wp-block-heading\">What are SMS verification codes?<\/h3>\n\n<p class=\"wp-block-paragraph\">SMS codes are a common form of 2FA. The example at the beginning of this article is an example of an SMS verification code. Once the user tries to log into their account, they\u2019re redirected to a second device where they receive a code to input on the login page to gain access to their account. In most cases, the primary device the user is logging in from is a laptop or desktop computer, and the second device is a mobile phone. Of course, there are variations on this if the user uses <a href=\"https:\/\/www.mailgun.com\/de\/blog\/product\/ein-sms-to-email-gateway-einrichten\/\" target=\"_tabs\" rel=\"noopener noreferrer\">voice over internet protocol (VOIP) solutions<\/a> like Google Voice.<\/p>\n\n<h3 class=\"wp-block-heading\">What are push notifications?<\/h3>\n\n<p class=\"wp-block-paragraph\">Instead of sending the user a password or code, the website or application can simply send a push notification to an app notifying the user that a login attempt is happening. Then, the user can confirm or deny the login attempt to grant or restrict access.<\/p>\n\n<h3 class=\"wp-block-heading\">What is a software token?<\/h3>\n\n<p class=\"wp-block-paragraph\">Software tokens, like TOTP, are one-time use, software-generated passcodes. First, the user must download and install a 2FA app on their computer, tablet, or smartphone. When they go to log into their account, they\u2019ll be prompted to enter a software token generated on their 2FA app. These tokens are similar to hardware tokens in that they expire about every 30-60 seconds.<\/p>\n\n<h2 class=\"wp-block-heading\">How do you use 2FA with Mailgun?<\/h2>\n\n<p class=\"wp-block-paragraph\">How you use 2FA differs depending on the web service. At Mailgun, our 2FA process requires the use of an authenticator app.<\/p>\n\n<p class=\"wp-block-paragraph\"><b><i>IMPORTANT: <\/i><\/b>Before we dive into our 2FA process, we want to highlight the importance of step 5 below. When activating 2FA for your Mailgun account, you\u2019ll see your account\u2019s \u201cpaper key.\u201d This key grants you access to the account if your authenticator app or device is no longer working. <b>Keep this key safe <\/b>\u2013 it\u2019s shown only once and can\u2019t be generated again. Not even our Mailgun team can retrieve your paper key for you.<\/p>\n\n<p class=\"wp-block-paragraph\">Without further ado, here\u2019s the process for using 2FA with your Mailgun account:<\/p>\n\n<ol class=\"wp-block-list\">\n<li>Log into your Mailgun account.<\/li>\n\n\n\n<li>Click the dropdown menu in the top right next to your username icon.<\/li>\n\n\n\n<li>Select <b>Security<\/b>.<\/li>\n\n\n\n<li>Enable the 2FA option by clicking the <b>Activate 2FA<\/b> button, but do <b>not<\/b> close the window.<\/li>\n\n\n\n<li><b>IMPORTANT: <\/b>Once you activate your 2FA, you\u2019ll see your 64-character paper key. Click <b>Download Key<\/b> and store it in a secure location. We cannot retrieve this for you once you close this page.<\/li>\n\n\n\n<li>On this same page, you\u2019ll see your secret key and QR code. You can retrieve these as needed.<\/li>\n\n\n\n<li>Install an authenticator app on your desktop or mobile device. Several applications will handle 2FA tokens for you. The most popular are <a href=\"https:\/\/support.google.com\/accounts\/answer\/1066447?co=GENIE.Platform%3DAndroid&amp;hl=en\" target=\"_tabs\" rel=\"noopener noreferrer\">Google Authenticator<\/a>, <a href=\"https:\/\/docs.microsoft.com\/en-us\/azure\/multi-factor-authentication\/end-user\/microsoft-authenticator-app-how-to\" target=\"_tabs\" rel=\"noopener noreferrer\">Microsoft Authenticator<\/a>, and <a href=\"https:\/\/lastpass.com\/auth\/\" target=\"_tabs\" rel=\"noopener noreferrer\">LastPass Authenticator<\/a>. These applications are typically installed on your smartphone and are supported on iOS, Android, and Windows.<\/li>\n\n\n\n<li>Add Mailgun to your list of services on your authenticator app. You\u2019ll be prompted to scan a QR code or add a secret key to access your account.<\/li>\n<\/ol>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4618\" width=\"1195\" height=\"1353\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/2fa_blog_image.png\" alt=\"QR code for 2FA.\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/2fa_blog_image.png 1195w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/2fa_blog_image-904x1024.png 904w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/2fa_blog_image-768x870.png 768w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/2fa_blog_image-265x300.png 265w\" sizes=\"(max-width: 1195px) 100vw, 1195px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">What do I do if I need help with 2FA in Mailgun?<\/h2>\n\n<p class=\"wp-block-paragraph\">If you ever need help using 2FA with your Mailgun account, don\u2019t hesitate to reach out to the <a href=\"https:\/\/app.mailgun.com\/app\/support\/list?utm_source=mailgun&amp;utm_medium=blog&amp;utm_campaign=2fa-1712\" target=\"_tabs\" rel=\"noopener noreferrer\">Mailgun Support team<\/a>. We\u2019ll sort things out.<\/p>\n\n<p class=\"wp-block-paragraph\">Keep in mind your paper key can help you authenticate if your app is no longer working.<\/p>\n\n<h2 class=\"wp-block-heading\">Wrapping up<\/h2>\n\n<p class=\"wp-block-paragraph\">And that\u2019s it! Use 2FA to keep your account extra secure. After all, your account is only as strong as your weakest access point. In fact, if you have a multi-user account with Mailgun, we recommend taking advantage of <a href=\"https:\/\/www.mailgun.com\/de\/blog\/product\/5-nutzerrollen-zugriffskontrolle-berechtigungen-mailgun-konto\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Mailgun\u2019s user roles<\/a>. On the off chance that your account ever gets compromised, <a href=\"https:\/\/www.mailgun.com\/de\/blog\/deliverability\/spam-von-meinem-konto-gesendet-was-tun\/\" target=\"_tabs\" rel=\"noopener noreferrer\">this article can help<\/a>.<\/p>\n\n<p class=\"wp-block-paragraph\">Keep your keys close and out of prying eyes, <a href=\"https:\/\/xkcd.com\/936\/\" target=\"_tabs\" rel=\"noopener noreferrer\">your passwords complex<\/a>, and your management team from firing you. Opt into 2FA to keep your accounts yours!<\/p>\n\n<p class=\"wp-block-paragraph\">Is 2FA one of your security requirements? At Mailgun we stay on top of security and compliance standards. Learn more <a href=\"https:\/\/www.mailgun.com\/de\/grossunternehmen\/sicherheit\/\" target=\"_tabs\" rel=\"noopener noreferrer\">here<\/a> about setting up an account and sending securely.<\/p>\n\n<p class=\"wp-block-paragraph\">Want more security tips and email know-how? Don\u2019t forget to subscribe to our newsletter so you never miss a beat.<\/p>\n    <div data-content-type=\"longform\" class=\"longform-spacings\">\r\n        <div class=\"cta bg-primary rounded-lg px-5 py-6 p-md-7 px-md-6\">\r\n                    <div class=\"form-subscription\">\r\n                            <div class=\"h4 mb-3\">\r\n                    Keep me posted! Get great resources in your inbox every week.                <\/div>\r\n                                    <form accept-charset=\"UTF-8\" action=\"\" enctype=\"multipart\/form-data\" data-form-subscription method=\"POST\" style=\"max-width: 400px;\">\r\n                <div class=\"row justify-content-between align-items-top g-2\">\r\n                    <div class=\"col-10\">\r\n                        <input type=\"email\" name=\"email\" class=\"form-control\" placeholder=\"Email\" autocomplete=\"email\" required>\r\n                        <div data-fs=\"error\" role=\"alert\" class=\"invalid-feedback\">\r\n                            Please complete this required field.                        <\/div>\r\n                    <\/div>\r\n                                            <div class=\"col-12 order-last mt-3 fs-xxs\" data-fs=\"acceptance\" style=\"display:none;\">\r\n                            \r\n                                <div class=\"form-check\">\r\n                                    <input id=\"formSubscriptionAcceptance-terms-6543\" class=\"form-check-input\"\r\n                                        type=\"checkbox\" name=\"terms\">\r\n                                    <label for=\"formSubscriptionAcceptance-terms-6543\" class=\"form-check-label text-body-color\">\r\n                                        Ich habe die Servicebedingungen gelesen und stimme ihnen zu.                                        <span class=\"hs-form-required\">*<\/span>\r\n                                    <\/label>\r\n                                <\/div>\r\n\r\n                            \r\n                                <div class=\"form-check\">\r\n                                    <input id=\"formSubscriptionAcceptance-privacy-4614\" class=\"form-check-input\"\r\n                                        type=\"checkbox\" name=\"privacy\">\r\n                                    <label for=\"formSubscriptionAcceptance-privacy-4614\" class=\"form-check-label text-body-color\">\r\n                                        Ich habe die Datenschutzerkl\u00e4rung gelesen und bin damit einverstanden.                                        <span class=\"hs-form-required\">*<\/span>\r\n                                    <\/label>\r\n                                <\/div>\r\n\r\n                                                    <\/div>\r\n                    \r\n                                            <div class=\"col-12 order-last fs-xxs mb-0 mt-2 text-body-color\">\r\n                            Send me the Mailjet Newsletter. I expressly agree to receive the newsletter and know that I can easily unsubscribe at any time.                        <\/div>\r\n                    \r\n                    <div class=\"col-2\">\r\n                        <button type=\"submit\" value=\"Submit\" aria-label=\"Submit\" class=\"btn btn-secondary btn-icon\">\r\n                            <svg aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/layout\/chevron-right.svg\"><\/svg>\r\n                        <\/button>\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <input type=\"hidden\" name=\"formSubscriptionRecaptchaToken\" data-fs=\"recaptcha-token\">\r\n                <input type=\"hidden\" name=\"customListID\" value=\"\">\r\n\r\n            <\/form>\r\n            <div data-fs=\"message-success\" style=\"display: none;\">\r\n                <p class=\"mb-0 mt-2 text-body-color\">\r\n                    Check your inbox monthly for your Mailjet Newsletter!                <\/p>\r\n            <\/div>\r\n        <\/div>\r\n        <\/div>\r\n    <\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Die Zwei-Faktor-Authentifizierung (2FA) ist eine unabh\u00e4ngige Sicherheitsebene f\u00fcr Ihre Konten. Wie bei vielen sich weiterentwickelnden Sicherheitsfunktionen bietet auch 2FA verschiedene Optionen. M\u00f6chten Sie lieber einen Code per SMS auf Ihr Smartphone erhalten? Eine biometrische Hardware-L\u00f6sung? Ein wechselndes Passwort? F\u00fcr welche Methode der zweiten Schutzebene entscheiden Sie sich?<\/p>\n","protected":false},"author":21,"featured_media":4555,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[22],"class_list":["post-25588","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-product"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sicherheit geht vor: Die Zwei-Faktor-Authentifizierung (2FA) verstehen - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"Die Zwei-Faktor-Authentifizierung (2FA) bietet Ihren Online-Konten zus\u00e4tzliche Sicherheit. 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