[MM3-users] Re: How to Choose the Best SMTP Relay Service Provider for Mailman?

On Wed, Sep 2, 2026, at 10:19 PM, Thomas Krichel via Mailman-users wrote:

...

For reputation:

1. Ensure you aren't an open relay
2. Have a PTR record
3. Publish SPF, DKIM, DMARC records
4. DKIM-sign all outbound emails

5. Don’t be on a linode VPS because one of the major RBLs has a bug up his ass about linode not doing enough to prevent spam from their customers and blacklisted their entire site.
6. Don’t have a bunch of mailing list members on RoadRunner.com/Spectrum because they’ll classify any attempt to send an email to 20+ people on there as “flooding” and bounce every to some but not all those people.

-- Paul Tomblin