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

Greg Sims greg at headingup.net
Wed Feb 22 02:59:57 EST 2017

Thanks for your feedback Carl.  Here is some additional information about
our environment.  We have a single server in a commercial data center
(Softlayer).  "Communicating" to the ISPs is a challenge.  No reply to
email and no way to discuss something like this on the telephone.  The only
answer is to construct a strategy that does not raise a "red flag".

---------- Forwarded message ----------
From: Carl Zwanzig <cpz at tuunq.com>
Date: Tue, Feb 21, 2017 at 10:07 PM
Subject: Re: [Mailman-Users] Warming IP Addresses -- Gradually Increasing
Email Volume
To: mailman-users at python.org

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.



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