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List:       postfix-users
Subject:    Re: SMTP session failure: 501 5.1.7 - how to solve it ?
From:       "Wilfried.Essig () essignetz ! de" <Wilfried ! Essig () essignetz ! de>
Date:       2017-06-23 9:40:33
Message-ID: c0fe4edc-a758-a5b8-7f15-278d5e385053 () essignetz ! de
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Please read http://www.postfix.org/DEBUG_README.html#mail


Willi


Am 23.06.2017 um 11:32 schrieb Zalezny Niezalezny:
> Dear Colleagues,
> 
> 
> I have a problem with my Postfix/Mailman configuration. Basicly everything
> is working fine except one thing.
> 
> When I`m sending message to mailman admins:
> 
> From: user@example.com
> To: mailman-owner@list.example.com
> 
> 
> Postfix generating SMTP session failure.
> 
> 
> Jun 23 10:59:25 2017 (18113) SMTP session failure: 501, 5.1.7 Bad sender
> address syntax, msgid: <CAKPGuG9oNCPVcqH=UZu1SOqFCvTh=
> QAMDwf_aZLcsKELFOyFUA@mail.gmail.com>
> 
> 
> So in this example, I have sent message
> From: zalezny.niezalezny@gmail.com
> To: mailman-owner@list.example.com
> 
> 
> For some reason Postfix is not able to acceppt sender E-mail address "
> zalezny.niezalezny@gmail.com". My Mailman server is behind the firewall,
> could it be that server is not able to resolve gmail.com domain and thats
> why rejecting it ? How to solve it ?
> 
> 
> 
> Cheers
> 
> Zalezny
> 
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