Lettermint

Lettermint is capable of sending SPF-aligned emails, meaning that they use your domain name in the Envelope From (or Return-Path) of email messages.

This makes it possible to achieve DMARC compliance via SPF.

You don’t need to create a TXT SPF record on your domain, since Lettermint takes care of it for you.

In fact, Lettermint uses a subdomain like lm-bounces.example.com in the Envelope From, and SPF verifiers look for the SPF record on this domain.

Since the lm-bounces.example.com subdomain is pointed to Lettermint with a CNAME record during the verification process, the SPF record will be managed by them.

Source

Lettermint supports custom DKIM signatures domains. This makes it possible to achieve DMARC compliance via DKIM.

Follow the domain verification process and create the TXT record for the DKIM key when asked.

Source

Lettermint supports DMARC compliance via both SPF and DKIM, with strict alignment on DKIM but only relaxed alignment on SPF.

Set up DMARC to:

• Receive email delivery reports to identify and fix authentication issues and find out who’s sending from your domain.
• Choose the action to apply when both SPF and DKIM are not aligned with your sender domain, blocking abuse attempts.

Use a DMARC monitoring tool like DMARCwise to simplify compliance and detect issues before they affect your domain reputation.

Here’s an example of a DMARC record, to be created as a TXT record on _dmarc.example.com:

v=DMARC1; p=none; rua=mailto:;

You may later strengthen the policy and change the alignment mode, but remember that in Lettermint:

• The SPF domain is a subdomain of your sender domain, so you cannot use the strict SPF alignment mode.
• The DKIM signature domain would instead match your sender domain exactly, so you may use strict DKIM alignment.

v=DMARC1; p=reject; rua=mailto:; adkim=s;

(aspf=r; for relaxed SPF is implied if left out.)

Guide to DMARC compliance