Hi, I have been using the SMTP relay offered by TPG to relay all my emails from my own mail server on my local network, connected via TPG to the NBN. Recently the SMTP relay has been denying my emails (see below). How can I resolve this issue so that my email server will be able to again send emails? Thank you for any help. Remote-MTA: dns; mail.tpg.com.au Diagnostic-Code: smtp; 550 mf-505: Sender Policy - Relay Denied host mail.tpg.com.au[52.63.237.70] said: 550 mf-505: Sender Policy - Relay Denied (in reply to MAIL FROM command) ... View more

I setup my own email server using iRedMail with postfix. This worked great when suddenly I was unable to send any messages to gmail and got the following error:   Diagnostic-Code: smtp; 550-5.7.1 [193.119.80.196] The IP you're using to send     mail is not authorized to 550-5.7.1 send email directly to our servers.     Please use the SMTP relay at your 550-5.7.1 service provider instead. Learn     more at 550 5.7.1  https://support.google.com/mail/?p=NotAuthorizedError     q26si3068097pgt.294 - gsmtp   I did what it said and setup a SMTP relay to TPG by adding the line:   relayhost = [mail.tpg.com.au]   to /etc/postfix/main.cf   Now I it fails and says this: This is the mail system at host mail.ifnulltrue.com. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message.                    The mail system <oggyprit@gmail.com>: host mail.tpg.com.au[203.12.160.34] said: 554 5.7.1     [TPG-S02] [1468Vxbn014915] Message rejected as it appears to be spam. Use     SMTP AUTH, PostOffice, or contact the Postmaster Team     <postmaster@tpg.com.au> (in reply to end of DATA command) Reporting-MTA: dns; mail.ifnulltrue.com X-Postfix-Queue-ID: 4FbRdW4Vynzfc8F X-Postfix-Sender: rfc822; chess@oggyp.com Arrival-Date: Thu,  6 May 2021 18:31:59 +1000 (AEST) Final-Recipient: rfc822; oggyprit@gmail.com Original-Recipient: rfc822;oggyprit@gmail.com Action: failed Status: 5.7.1 Remote-MTA: dns; mail.tpg.com.au Diagnostic-Code: smtp; 554 5.7.1 [TPG-S02] [1468Vxbn014915] Message rejected as     it appears to be spam. Use SMTP AUTH, PostOffice, or contact the Postmaster     Team <postmaster@tpg.com.au> Return-Path: <chess@oggyp.com> Received: from mail.ifnulltrue.com (mail.ifnulltrue.com [127.0.0.1])     by mail.ifnulltrue.com (Postfix) with ESMTP id 4FbRdW4Vynzfc8F     for <oggyprit@gmail.com>; Thu,  6 May 2021 18:31:59 +1000 (AEST) Authentication-Results: mail.ifnulltrue.com (amavisd-new);     dkim=pass (2048-bit key) reason="pass (just generated, assumed good)"     header.d=oggyp.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=oggyp.com; h=     content-transfer-encoding:content-type:message-id:user-agent     :subject:to:from:date:mime-version; s=dkim; t=1620289918; x=     1621153919; bh=EgE/FdTNRiCHrFPjiJZoxUsivHWpjBT1qwZFuzPjb0E=; b=E     tBeLKpbFELvpP1V1W6yRF8rsXjqXfsHPTaeNgVKvVIxFGNzpMnY9KBW+7nbVxYuC     1WsnXSYIF4LbEo8lMToYyq3ya3qp/SeqRy9DF2G+ENGwQCPLquG+SY84eh5TBP6f     VHDKeR1OJgpGGYswX4o2Q16x8J9xsx94tEzopF8msASlBmgdyzKj+exOZKpqggMe     jCV/Tqfs2sTuz/ZDXerPINK+8abOdjDNCFGOks8hKGX9eeYNAfE5DPggYQyGZE9F     6kXqA8Ztpf/X/AttbXlfUHlrIxSdTUUzzCXgEhqA65521avajSx7vLxhWaOJGhxd     9d8VfT3D2pO/6goIb6wzA== X-Virus-Scanned: Debian amavisd-new at mail.ifnulltrue.com Received: from mail.ifnulltrue.com ([127.0.0.1])     by mail.ifnulltrue.com (mail.ifnulltrue.com [127.0.0.1]) (amavisd-new, port 10026)     with ESMTP id Sz0ru4d_i7bn for <oggyprit@gmail.com>;     Thu,  6 May 2021 18:31:58 +1000 (AEST) Received: from mail.ifnulltrue.com (mail.ifnulltrue.com [127.0.0.1])     by mail.ifnulltrue.com (Postfix) with ESMTPSA id 4FbRS64FZNzfbPf     for <oggyprit@gmail.com>; Thu,  6 May 2021 18:23:50 +1000 (AEST) MIME-Version: 1.0 Date: Thu, 06 May 2021 18:23:50 +1000 From: chess@oggyp.com To: oggyprit@gmail.com Subject: Test User-Agent: Roundcube Webmail Message-ID: <c97661ea1abffd612189abd9e4239dc1@oggyp.com> X-Sender: chess@oggyp.com Return-Receipt-To: chess@oggyp.com Disposition-Notification-To: chess@oggyp.com Content-Type: text/plain; charset=US-ASCII;  format=flowed Content-Transfer-Encoding: 7bit Any help would be great.   Thanks, Oscar ... View more