On 6/30/20 9:56 AM, tom@gather.coop wrote:
I have a Mailman 3 server up and running but I'm terrified to migrate to it from my existing Mailman 2 provider for fear that services like Gmail will randomly start blacklisting my IP with little I can do about it. I have SPF records set up so I'm hoping I'll be Ok but I'd like to have a backup plan.
Has anyone ever tried using an external service like Mailgun or Sendgrid as a relay? I tried both but couldn't get either to work due to their sender authentication mechanism. They want all 'From:' headers to be from domains that are pre-authenticated as senders. But Mailman keeps the 'From' header from the original sender so it won't match any authenticated domains. Right?
There is no reason to be afraid if you are sending out legitimate communications. SPF records will help. You will also need to enable DMARC mitigation on your lists and Mailman 3 does that very well as Mailman 2 did. It also helps if you sign your outbound mail with DKIM. With those 3 things in place, you should have no problem sending mail. Keep in mind AT&T will probably block you if the IP address you are using is new. That is standard practice for them. It's easy to get that block remove. Same goes for Comcast using their Vader RBL.
I have found Gmail to be the easiest mail provider to work with. I don't think I have ever seen a permanent block from them. But then again, I don't host spammers.
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