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

[Carl Zwanzig]

On 2/20/2017 10:01 PM, Greg Sims wrote:
> We have three mailman lists with over 20K members.  The lists are
> subscription based which distribute content to members by email each
> morning.
[...]
> ​I'm sure sending 20K emails on day one would not make the ISPs very happy.

Have you talked to the ISP? The environment and connections also matter. One 
server on the end of a residential DSL is a bit different from a hosted 
instance from a large corporate system.

If nothing else and assuming a moderate business or academic environment, 
the mailman server would be sending everything to a local relay server 
(postfix/sendmail/exim/etc) and that would be sending the mail to it's 
destinations. If the relay server is at the ISP, definitely talk to them 
first; I don't think "warming" a connection will help. (And if you have your 
own relay and send to all destinations from there, the ISP's server isn't in 
the picture and they shouldn't care about the traffic.)

YMMV, of course.

Later,

z!