{"id":20570,"date":"2019-07-16T00:00:00","date_gmt":"2019-07-16T00:00:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/consejos-trucos-evitar-filtro-spam-gmail-usar-action-mailer-ruby-on-rails\/"},"modified":"2026-09-15T04:47:44","modified_gmt":"2026-09-15T04:47:44","slug":"consejos-trucos-evitar-filtro-spam-gmail-usar-action-mailer-ruby-on-rails","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/es\/blog\/email\/consejos-trucos-evitar-filtro-spam-gmail-usar-action-mailer-ruby-on-rails\/","title":{"rendered":"Consejos y trucos: c\u00f3mo evitar los filtros de spam de Gmail al usar Action Mailer de Ruby on Rails"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">It has become clear from our support logs that a lot of developers use Action Mailer to send emails. If you are one of these developers you should know that there is one issue that we have seen repeatedly which will cause your emails to get filtered as spam by Gmail:\u00a0malformed message-ID. This also may occur with other libraries but we see this issue mostly with Action Mailer.<\/p>\n\n<p class=\"wp-block-paragraph\">We created our\u00a0<a href=\"https:\/\/documentation.mailgun.com\/en\/latest\/api-intro.html\" target=\"_tabs\" rel=\"noopener noreferrer\">REST API<\/a>\u00a0so that you don\u2019t have to worry about technicalities like these (we set a valid\u00a0message-ID\u00a0by default) but we understand that you may want to use the tools you are already familiar with.<\/p>\n\n<p class=\"wp-block-paragraph\">If you want to use Action Mailer with Mailgun, it\u2019s pretty easy to get started:<\/p>\n    <div data-content-type=\"longform\" class=\"code-snippet longform-spacings rounded-lg overflow-hidden shadow \" data-count=\"1\">\r\n        <ul class=\"nav nav-buttons code-snippet__tabs longform-except position-relative d-flex gap-2 flex-wrap p-3\" role=\"tablist\">\r\n\r\n                            \r\n                    \r\n                        <li class=\"nav-item\" role=\"presentation\">\r\n                            <button class=\"nav-link active\" data-bs-toggle=\"tab\" data-bs-target=\"#code_0\" type=\"button\" role=\"tab\" aria-controls=\"code_0\" aria-selected=\"true\">\r\n                                PHP                            <\/button>\r\n                        <\/li>\r\n\r\n                    \r\n                            \r\n        <\/ul>\r\n        <div class=\"code-snippet__tab-content tab-content\">\r\n\r\n                            \r\n                    <div class=\"tab-pane show active\" id=\"code_0\" role=\"tabpanel\" aria-labelledby=\"code_0\">\r\n                        <div class=\"code-snippet__code-wrapper\">\r\n                            <div class=\"nav nav-buttons code-snippet__copy-wrapper\">\r\n                                <button type=\"button\" class=\"nav-link code-snippet__copy\" data-clipboard-target=\"#code_0_content\" data-clipboard-label=\"Copia al portapapeles\" data-clipboard-success-label=\"\u00a1Copiado!\" data-clipboard-error-label=\"No se ha podido copiar\" data-tooltip=\"Copia al portapapeles\" data-tooltip-placement=\"left\" role=\"tooltip\" aria-label=\"Copia al portapapeles\">\r\n                                    <svg class=\"code-snippet__copy-icon code-snippet__copy-icon--default\" width=\"24\" height=\"24\" aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/file-stack.svg\"><\/svg>\r\n                                    <svg class=\"code-snippet__copy-icon code-snippet__copy-icon--success\" width=\"24\" height=\"24\" aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/badge-check.svg\"><\/svg>\r\n                                <\/button>\r\n                            <\/div>\r\n                            <pre class=\"w-100 h-100 m-0 line-numbers language-PHP\">\r\n                                <code id=\"code_0_content\" class=\"language-PHP\">\r\n\r\n                                    config.action_mailer.delivery_method = :smtp\r\nconfig.action_mailer.default_charset = &quot;utf-8&quot;\r\nconfig.action_mailer.perform_deliveries = true\r\nconfig.action_mailer.raise_delivery_errors = true\r\nconfig.action_mailer.smtp_settings = {\r\n     :authentication =&gt; :plain,\r\n     :address =&gt; &quot;smtp.mailgun.org&quot;,\r\n     :port =&gt; 587,\r\n     :domain =&gt; &quot;my-mailgun-domain.com&quot;,\r\n     :user_name =&gt; &quot;postmaster@my-mailgun-domain.com&quot;,\r\n     :password =&gt; &quot;my-password&quot;\r\n}\r\n                                <\/code>\r\n                            <\/pre>\r\n                        <\/div>\r\n                    <\/div>\r\n                                    <\/div>\r\n    <\/div>\r\n\n<p class=\"wp-block-paragraph\">The issue is that if you do not specify the\u00a0message-ID, Action Mailer populates this header with a default value which may not be a valid\u00a0message-ID. In addition, if you are connecting to an SMTP relay, that\u00a0message-ID\u00a0probably does not reflect the domain that is actually sending the email. It may say something like \u201c&lt;[uid]@localhost.localdomain&gt;\u201d.<\/p>\n\n<p class=\"wp-block-paragraph\">Gmail is very strict about making sure that the\u00a0message-ID\u00a0in the MIME headers follows\u00a0<a href=\"http:\/\/tools.ietf.org\/html\/rfc2822#section-3.6.4\" target=\"_tabs\" rel=\"noopener noreferrer\">RFC 2822<\/a>and that the domain in the\u00a0message-ID\u00a0is the same as the sending domain.<\/p>\n\n<p class=\"wp-block-paragraph\">According to the RFC the\u00a0message-ID\u00a0should have the following format:\u00a0\u201c&lt;[uid]@[sendingdomain.com]&gt;\u201d<\/p>\n\n<p class=\"wp-block-paragraph\">There is a\u00a0<a href=\"http:\/\/stackoverflow.com\/questions\/6598343\/set-the-message-id-mail-header-in-rails3-actionmailer\" target=\"_tabs\" rel=\"noopener noreferrer\">thread on Stack Overflow<\/a>\u00a0about how to set the\u00a0message-ID\u00a0in Rails, see example excerpt below:<\/p>\n    <div data-content-type=\"longform\" class=\"code-snippet longform-spacings rounded-lg overflow-hidden shadow \" data-count=\"1\">\r\n        <ul class=\"nav nav-buttons code-snippet__tabs longform-except position-relative d-flex gap-2 flex-wrap p-3\" role=\"tablist\">\r\n\r\n                            \r\n                    \r\n                        <li class=\"nav-item\" role=\"presentation\">\r\n                            <button class=\"nav-link active\" data-bs-toggle=\"tab\" data-bs-target=\"#code_0\" type=\"button\" role=\"tab\" aria-controls=\"code_0\" aria-selected=\"true\">\r\n                                PHP                            <\/button>\r\n                        <\/li>\r\n\r\n                    \r\n                            \r\n        <\/ul>\r\n        <div class=\"code-snippet__tab-content tab-content\">\r\n\r\n                            \r\n                    <div class=\"tab-pane show active\" id=\"code_0\" role=\"tabpanel\" aria-labelledby=\"code_0\">\r\n                        <div class=\"code-snippet__code-wrapper\">\r\n                            <div class=\"nav nav-buttons code-snippet__copy-wrapper\">\r\n                                <button type=\"button\" class=\"nav-link code-snippet__copy\" data-clipboard-target=\"#code_0_content\" data-clipboard-label=\"Copia al portapapeles\" data-clipboard-success-label=\"\u00a1Copiado!\" data-clipboard-error-label=\"No se ha podido copiar\" data-tooltip=\"Copia al portapapeles\" data-tooltip-placement=\"left\" role=\"tooltip\" aria-label=\"Copia al portapapeles\">\r\n                                    <svg class=\"code-snippet__copy-icon code-snippet__copy-icon--default\" width=\"24\" height=\"24\" aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/file-stack.svg\"><\/svg>\r\n                                    <svg class=\"code-snippet__copy-icon code-snippet__copy-icon--success\" width=\"24\" height=\"24\" aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/badge-check.svg\"><\/svg>\r\n                                <\/button>\r\n                            <\/div>\r\n                            <pre class=\"w-100 h-100 m-0 line-numbers language-PHP\">\r\n                                <code id=\"code_0_content\" class=\"language-PHP\">\r\n\r\n                                    require &#039;digest\/sha2&#039;\r\nclass UserMailer &quot;#{Digest::SHA2.hexdigest(Time.now.to_i.to_s)}@yourdomain.com&quot;\r\n   # ... the rest of your mailer class\r\nend\r\n                                <\/code>\r\n                            <\/pre>\r\n                        <\/div>\r\n                    <\/div>\r\n                                    <\/div>\r\n    <\/div>\r\n\n<p class=\"wp-block-paragraph\">So, make sure to test that the\u00a0message-ID\u00a0is getting set correctly or Gmail will junk your emails!<\/p>\n\n<p class=\"wp-block-paragraph\">Happy emailing!<\/p>\n\n<p class=\"wp-block-paragraph\">Mailgunners<\/p>\n\r\n    <aside data-content-type=\"longform\"  class=\"banner-block longform-spacings rounded-lg shadow-lg px-5 py-6 px-md-6 py-md-7 p-lg-7 bg-light\" data-theme=\"dark\" aria-labelledby=\"banner-block-block_a00773b3404c6845562fee44b52bed6e\">\r\n                    <p class=\"text-uppercase section-caption text-body-color\">\r\n                Sign Up            <\/p>\r\n                            <p class=\"h4 text-accent fw-bold\" id=\"banner-block-block_a00773b3404c6845562fee44b52bed6e\">\r\n                It&#8217;s easy to get started. And it&#8217;s free.            <\/p>\r\n                            <div class=\"mb-0 text-body-color\">\r\n                                    <div class=\"content-body mb-0 text-body-color\">See what you can accomplish with the world\u2019s best email delivery platform.<\/div>\r\n                            <\/div>\r\n        \r\n        <div class=\"text-start mt-5\"><a href=\"https:\/\/signup.mailgun.com\/new\/signup\"  class=\"btn btn-secondary\" >Get started<\/a><\/div>\r\n    <\/aside>\r\n\r\n","protected":false},"excerpt":{"rendered":"<p>Nuestros registros de asistencia revelan que una gran cantidad de profesionales del desarrollo utilizan Action Mailer para enviar emails. Si te encuentras en este grupo, debes saber que hay un problema recurrente que provoca que Gmail filtre tus emails como spam: un message-ID con un formato incorrecto. Esto tambi\u00e9n puede ocurrir con otras bibliotecas, pero vemos este problema sobre todo con Action Mailer.<\/p>\n","protected":false},"author":13,"featured_media":4074,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[20],"class_list":["post-20570","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-email"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Consejos y trucos: c\u00f3mo evitar los filtros de spam de Gmail al usar Action Mailer de Ruby on Rails<\/title>\n<meta name=\"description\" content=\"Nuestros registros de asistencia revelan que una gran cantidad de profesionales del desarrollo utilizan Action Mailer para enviar emails. 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