Adding a mailto List-Unsubscribe header to email in ACS




I'm having some trouble with my gmail emails marking my ACS sends as spam. I'm using Return Path to get information on inbox placement, and it mentioned that gmail inbox placement rate is suffering because there is no "mailto List-Undsubscribe header" in the email. How does one implement this header in ACS?

Thanks so much!

Danny Diaz

Accepted Solutions (1)

Accepted Solutions (1)

Answers (2)

Answers (2)



I also just tested sending an email using Litmus's spam analysis tool and it confirmed that "We have detected your message does NOT include a List-Unsubscribe header."



Hi Pablo,

Thanks for your reply!

It looks like the unsubscribe link is showing up in gmail after all (just because I have it in the footer of the email):


Here is my code for the opt out link at the bottom of the email:

<% if( document.mode != 'forward' ) { %>

<table  cellspacing="0" cellpadding="0" border="0" align="center" style="width:100%">



<td style="font: bold 11px Corbel, Verdana, Frutiger, Helvetica,sans-serif; color: #ffffff; text-align: center; background-color: #00703c" valign="top" >

<p style="font: normal 11px Corbel, Verdana, Frutiger, Helvetica,sans-serif;">You've received this email because you are part of <br><%@ value object='branding' xpath='@publicLabel' %>&rsquo;s email list.<br>  If you wish to unsubscribe, please

<a href="" _label="Opt-out link" _type="optout" style="color:#ffffff;">click here</a>.







Would having a second opt out link at the top as well help?

I figure also I still need a "mailto" unsubscribe link. For example, this litmus article shows the following in an email header:


But I don't quite understand how a mailto unsubscribe works.