I would not use smtp-auth because my mail server is simply relaying a mail to them.
I think I noticed this happening when my mail server sends mail to ext-mx01.kolabsys.com, because mail is accepted if sent via ext-mx02.kolabsys.com.
Here are the headers from the email that was bounced, and here we see the From set to users@lists.roundcube.net upon reply, and now I know exactly why this happens! I have a Roundcube plugin installed called custom_from. https://github.com/r3c/Custom-From "When replying to an e-mail sent to you through an address not in your identities list, plugin will automatically fire and set "From:" header to the address the original e-mail was sent to."
MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Date: Wed, 27 Nov 2013 13:23:56 +0100 From: Roundcube Users mailing list users@lists.roundcube.net To: users@lists.roundcube.net X-Sender: users@lists.roundcube.net User-Agent: Roundcube Webmail/0.9.5
This explains everything :)
On 2013-11-27 14:54, Benny Pedersen wrote:
Simon Loewenthal skrev den 2013-11-27 14:22:
said: 553 5.7.1 users@lists.roundcube.net: Sender address rejected: not logged in
the above error is that you either use there domain or not using smtp auth
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