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These rules apply if you are sending Emails from your own infrastructure, but they are also important if you are using an Email delivery provider like Sendgrid because in most cases you are assigned one (or more) dedicated IP addresses, so for “the world” this is not different to i.e. for all intents and purposes this is your own SMTP server. |
Technical rules
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To track your listing you can use The Spamhouse Project (https://www.spamhaus.org) or MX Toolbox (https://mxtoolbox.com/).
Configure your Message-ID to contain your sender domain
Certain email providers expect the Message-Id header to end with the official sender domain name. Set cmsbs.mail.messageId.hostname accordingly.
Format of Message-ID header as sent by UM: UM.<delivery_ticket>@<domain>
delivery_ticket is the Delivery Ticket of the outgoing email.
By default, domain is the name or the IP address of the SMTP server given in cmsbs.mail.smtpserver. This part can be overwritten via cmsbs.mail.messageId.hostname.
Optional technical measures
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