[Mailman-Users] mailman on google comput engine

Adam Goldberg adam at agp-llc.com
Thu Mar 21 13:58:41 EDT 2019

A consumer internet connection frequently has incoming port 25 simply blocked, and outgoing port 25 either blocked entirely or blocked for all but the ISP’s outgoing mail server.

There are ways around this.    Consider duocircle.com “backup mx” service. 

> On Mar 21, 2019, at 1:44 PM, Mark Sapiro <mark at msapiro.net> wrote:
> On 3/20/19 11:40 PM, 황병희 wrote:
>> i just did make one vm instance Ubuntu 18.04 on google compute
>> engine. barely i did install postfix at there. hmm if possible, i wish
>> to run mailing service for my family and me -- it needs a little bit some comunication plus some
>> records about family history. yes i want GNU Mailman very
>> much!!! google compute engine blocked port 25 by default. in this case i
>> can run mailman with other port (example 625)? again question, Mailman
>> can act with 625 or 1625 or 2625, ...?
> Are you talking incoming or outgoing mail. There are multiple pieces
> involved. If incoming port 25 is blocked, Postfix won't be able to
> receive incoming mail to the list and you're dead at that point.
> Presumably, it is only outgoing port 25 that is blocked. By default
> Mailman delivers to the local MTA at localhost:25 which may or may not
> be blocked but probably isn't. You can change these by setting SMTPHOST
> and SMTPPORT in mm_cfg.py, but if you are going to deliver via the local
> Postfix, Postfix will relay the outgoing mail to port 25 at the
> recipient MXs. You can't really change that because you can't tell the
> recipient MXs to listen on other ports.
> You can get Postfix to relay via another MTA, e.g. at your ISP, and
> authenticate to it.
> If your Mailman is 2.1.23 or later (the Ubuntu 18.04 package is 2.1.26)
> you can get Mailman to relay directly to an outside MTA with
> authentication via the mm_cfg.py settings SMTP_AUTH, SMTP_USER,
> -- 
> Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
> San Francisco Bay Area, California    better use your sense - B. Dylan
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