Glossary
List-unsubscribe is an email header field that allows recipients to opt out of future emails without clicking links in the message body. It provides mailbox providers with a machine-readable unsubscribe method – often displayed as a native “Unsubscribe” button in the email client interface (e.g., Gmail, Apple Mail).
There are two types of list-unsubscribe mechanisms:
Most inbox providers (especially Yahoo and Gmail) expect senders to include this header, especially in promotional or bulk mail. Lack of a list-unsubscribe header can:
At Mailgun, we strongly recommend adding list-unsubscribe headers to all email, particularly marketing and bulk messages. It improves user trust and protects deliverability by reducing spam complaints.
Note: While some inbox providers still allow the use of mailto, the URL-based method is becoming the preferred standard. On top of that, Gmail and Yahoo have explicitly stated that they require support for the URL method using POST for one-click unsubscribes. This means that the URL used in list-unsubscribe must be able to receive POST requests and the header “List-Unsubscribe-Post: List-Unsubscribe=One-Click” should also be added to the email header. For more on how to set up a List-Unsubscribe-Post header, read our help article.
When you visit any web site, it may store or retrieve information on your browser, mostly in the form of cookies. This information might be about you, your preferences or your device and is mostly used to make the site work as you expect it to. The information does not usually directly identify you, but it can give you a more personalised web experience. Because we respect your right to privacy, you can choose not to allow some types of cookies. Click on the different category headings to find out more and change our default settings. However, blocking some types of cookies may impact your experience of the site and the services we are able to offer.
Cookie Statement
These cookies are necessary for the website to function and cannot be switched off in our systems. They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences, logging in or filling in forms. You can set your browser to block or alert you about these cookies, but some parts of the site will not then work. These cookies do not store any personally identifiable information.
Cookie details
| Cookie Subgroup | Cookies | Cookies used |
|---|---|---|
| documentation.mailgun.com | _cfuvid , __cfruid | First Party |
| .mailgun.com | OptanonConsent | First Party |
| mailgun.com | actualOptanonConsent , apt.sid , OptanonAlertBoxClosed , mail_session | First Party |
| app.mailgun.com | connect.sid , SERVERID | First Party |
| hello.mailgun.com | uvts , __cf_bm | First Party |
| m.stripe.com | m | Third Party |
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookie details
| Cookie Subgroup | Cookies | Cookies used |
|---|---|---|
| hello.mailgun.com | ubpv , ubvs | First Party |
| dev.mailgun.com | _an_uid | First Party |
| app.mailgun.com | rl_page_init_referring_domain , rl_anonymous_id , rl_group_trait | First Party |
| mailgun.com | _vwo_ds , test_rudder_cookie , _vis_opt_s , rl_group_id , rl_user_id , _ga , rl_session , rl_page_init_referrer , ubvt , _vwo_uuid , apt.uid , optimizelyEndUserId , _gat , _vwo_sn , _ga_xxxxxxxxxx , _gid , _uetvid , _vis_opt_test_cookie | First Party |
| hello.learn.mailgun.com | visitor_id | Third Party |
These cookies enable the website to provide enhanced functionality and personalisation. They may be set by us or by third party providers whose services we have added to our pages. If you do not allow these cookies then some or all of these services may not function properly.
Cookie details
| Cookie Subgroup | Cookies | Cookies used |
|---|---|---|
| hello.mailgun.com | _gd_session | First Party |
| mailgun.com | __q_state_zkTi4FmbUJniF8K2 , _vwo_uuid_v2 , apt.temp-xxxxxxxxxxxxxxxxxx , __tld__ | First Party |
| demo.mailgun.com | _gd_visitor | First Party |
| dev.mailgun.com | _pin_unauth , __uvt | First Party |
| app.mailgun.com | __stripe_mid , __stripe_sid | First Party |
| mailgun.zendesk.com | _cfuvid, __cf_bm, __cfruid | Third Party |
| vimeo.com | _cfuvid, __cf_bm, vuid | Third Party |
| producthunt.com | __cf_bm | Third Party |
| goldcast.io | __cf_bm | Third Party |
These cookies may be set through our site by our advertising partners. They may be used by those companies to build a profile of your interests and show you relevant adverts on other sites. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. If you do not allow these cookies, you will experience less targeted advertising.
Cookie details
| Cookie Subgroup | Cookies | Cookies used |
|---|---|---|
| www.mailgun.com | pardot | First Party |
| app.mailgun.com | rl_trait | First Party |
| hello.mailgun.com | visitor_id | First Party |
| mailgun.com | _gat_gtag_xxxxxxxxxxxxxxxxxxxxxxxxxxx , _uetsid , _fbp , _tt_enable_cookie , _ttp , _rdt_uuid , __q_domainTest , _gcl_au | First Party |
| linkedin.com | bcookie, lidc, li_gc | Third Party |
| pi.pardot.com | pardot, lpv830283 | Third Party |
| bing.com | MSPTC, MUID | Third Party |
| hello.learn.mailgun.com | pardot | Third Party |
| pardot.com | visitor_id | Third Party |
| doubleclick.net | IDE, test_cookie | Third Party |
| youtube.com | VISITOR_PRIVACY_METADATA, VISITOR_INFO1_LIVE, __Secure-xxxxxxx | Third Party |
| www.google.com | _GRECAPTCHA | Third Party |
These cookies are set by a range of social media services that we have added to the site to enable you to share our content with your friends and networks. They are capable of tracking your browser across other sites and building up a profile of your interests. This may impact the content and messages you see on other websites you visit. If you do not allow these cookies you may not be able to use or see these sharing tools.
Cookie details
| Cookie Subgroup | Cookies | Cookies used |
|---|---|---|
| youtube.com | YSC | Third Party |