Mailing List Message #105266
From: Tom Rymes <>
Subject: Re: List server warnings from null sender: rejected!
Date: Tue, 04 Nov 2014 08:42:41 -0500
To: CommuniGate Pro Discussions <>
The fix OUGHT to take place at those broken sites, but let's be honest:
it won't.

Given that basic truth, is there a way that the OP can configure CGP to
avoid this problem, or will that cause other issues? How do other MTAs
handle this issue?


On 11/03/2014 2:34 PM, Mark J Strawcutter wrote:
> CGP is behaving properly.
> Sites that reject mail with a return-path of <> are behaving improperly,
> often under the misguided impression that it helps reduce incoming spam.
> The fix/work-around must take place at the broken site
> Mark
> On 10/25/2014 10:04 AM, Gib Henry wrote:
>> CGP’s list server apparently sends warning messages with a null
>> sender.  I
>> thought this was permissible under the RFCs, but some recipients’ mail
>> servers
>> object.  I get a lot of responses like “return-path address <>
>> rejected by
>> domain.dom:\e 550 <> Sender rejected.”  Is there a fix or a
>> work-around?  Thanks
>> in advance.  Cheers,
>> —
>> Gib Henry

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