Mailchimp

Without dedicated IP

Mailchimp is not capable of sending SPF-aligned emails, meaning that Mailchimp mail servers won’t use your domain name in the Envelope From (or Return-Path) of email messages.

In this situation it’s not possible to achieve DMARC compliance via SPF with Mailchimp.

Since Mailchimp uses a domain of theirs as the Envelope From (usually a subdomain of mcsv.net, mcdlv.net or rsgsv.net) and SPF retrieves the SPF TXT record from that domain, you don’t need to allow Mailchimp in the SPF record of your domain.

While you may find guides and resources telling you to add include:servers.mcsv.net to your SPF record, there’s no technical reason to do that: if anything, this will increase the risk of reaching the limit of 10 DNS lookups.

Source

Mailchimp supports DMARC compliance via DKIM, thanks to custom DKIM signatures.

To set up Mailchimp DKIM on your domain, follow these instructions:

• Go to the Domains page of your Account & billing settings.
• Click Start Authentication next to your domain name.
• Follow the steps and you will be provided with two CNAME DNS records for the DKIM keys. They should look like this:

• Continue to complete the process.

Note that these records may slightly differ based on your account, so make sure you check the correct configuration on Mailchimp.

Source

Brevo supports DMARC compliance via DKIM only.

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 keep in mind that Mailchimp supports DMARC compliance only through DKIM alignment.

Here’s an example of a DMARC record with a strengthened policy and strict alignment on DKIM:

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

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

Guide to DMARC compliance