On 6/30/20 7:03 AM, Brian Carpenter wrote:
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. ... 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.
You also need to ensure you have full circle DNS <https://en.wikipedia.org/wiki/Forward-confirmed_reverse_DNS>. That together with SPF and DKIM signing of outbound mail is virtually essential for deliverability.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan