Add an Unsubscribe mail header

Email deliverability seems to be an increasing problem these days. One issue that can be flagged by mail-tester.com if you use the email address it gives to send an email from the oeredsr tab in Sellerdeck is that your message does not contain a List-Unsubscribe header.

This is easily remedied in Selerdeck. First you need an unsubscribe email address on your domain. It needs checking regularly so maybe make it a forwarder to your main email address.

unsubscribe@graphicz.co.uk

The you need a URL where the customer can be directed to im order to unsubscribe, either a custom page or maybe the contact us page.

The header will then look something like this

List-Unsubscribe: <mailto: unsubscribe@graphicz.co.uk?subject=unsubscribe>, <http://www.graphicz.co.uk/https://www.graphicz.co.uk/contact.php>

If you open the file ‘SmtpLibrary.pm’ and search for: –

my $mail_headers

You will see all of the email headers there, so I think you should be able to add it just above: –

"MIME-Version: 1.0\n";

my $mail_headers =	"From: $mail_from\n".
"To: $mail_to\n".
"Reply-to: $mail_replyTo\n".
"Subject: ".encode('MIME-Header', $mail_subject)."\n".
"Date: $sNow\n";
"List-Unsubscribe: <mailto: unsubscribe@graphicz.co.uk?subject=unsubscribe>, <https://www.graphicz.co.uk/contact.php>";
"MIME-Version: 1.0\n";

Then upload and test. Provided without warranty express or implied. Thanks to Gary Green at Sellerdeck Support

It is also worth adding a DMARC record to your domain name’s Zome editor:

 _dmarc.graphicz.co.uk  v=DMARC1; p=none

And in the Sellerdeck Page type ‘HTML Email Cart’ remove the cmpany logo leaving the company name in plain text and replace

<actinic:variable name="CatalogHomeURL" />

<actinic:variable name="CatalogURL" />info.html

with the hard coded domain name and info page link as the variables do not always work in the recipient email