[Mailman-Users] Fwd: Warming IP Addresses -- Gradually Increasing Email Volume

[Carl Zwanzig]

On 2/22/2017 7:33 AM, Greg Sims wrote:
> The communications I have with my ISP (Softlayer) is fine.  The issue is
> with AOL, Yahoo and others.  These folks are impossible to communication
> with.

Yes they are and there's not much to be done about it (issues with aol & 
yahoo have been covered extensively on this list, please check the 
archives).  It was not clear which ISP you were referring to so everyone 
assumes the closest one.

Assuming that mailman delivers to a real MTA (postfix/sendmail/etc) on your 
server and that sends the mail out, you need to make sure the new server/IP 
has proper a proper DKIM/SPF config and then look at the whitelist 
procedures at aol/yahoo/etc. You also need the latest mailman (2.1.23) with 
DMARC mitigation configs (also discussed on this list).

Later,

z!