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List:       postfix-users
Subject:    Mail forwarding through a relay
From:       John Regan <jreganoct () gmail ! com>
Date:       2019-09-12 2:12:29
Message-ID: CAPUF-gNEH8CkzDNgvnKa53fY70c1SxFuTFhchTbCyMhfRy1K2g () mail ! gmail ! com
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Hi,

I have a postfix-3.2.6 system that acts as a mail server and pop/imap using
dovecot for a small domain. The problem is that people are increasingly
using it as a relay to a personal account, such as Gmail and Yahoo.

This is resulting in the receiving system rejecting the message due to SPF
failing.

Sep 11 22:03:06 email postfix/smtp[1187]: 33AA3962A9648: to=<
user@example.com>, orig_to=<user@origdomain.com>,
relay=mx0.digitalwest.net[72.29.183.105]:25,
delay=2.7, delays=0.05/0/1.5/1.1, dsn=5.0.0, status=bounced (host
mx0.digitalwest.net[72.29.183.105] said: 550-[SPF] 44.104.18.100 is not
allowed to send mail from mchat.booking.com. 550-Message blocked - Please
check settings. See 550
http://support.digitalwest.net/KB/a163/550-spf-not-allowed-to-send-mail.aspx
(in reply to RCPT TO command))

Is my only option here to do something like SRS or can this be fixed
another way?

[Attachment #3 (text/html)]

<div dir="ltr">Hi,<div><br></div><div>I have a postfix-3.2.6 system that acts as a \
mail server and pop/imap using dovecot for a small domain. The problem is that people \
are increasingly using it as a relay to a personal account, such as Gmail and \
Yahoo.</div><div><br></div><div>This is resulting in the receiving system rejecting \
the message due to SPF failing.  </div><div><br></div><div>Sep 11 22:03:06 email \
postfix/smtp[1187]: 33AA3962A9648: to=&lt;<a \
href="mailto:user@example.com">user@example.com</a>&gt;, orig_to=&lt;<a \
href="mailto:user@origdomain.com">user@origdomain.com</a>&gt;, relay=<a \
href="http://mx0.digitalwest.net">mx0.digitalwest.net</a>[72.29.183.105]:25, \
delay=2.7, delays=0.05/0/1.5/1.1, dsn=5.0.0, status=bounced (host <a \
href="http://mx0.digitalwest.net">mx0.digitalwest.net</a>[72.29.183.105] said: \
550-[SPF] 44.104.18.100 is not allowed to send mail from <a \
href="http://mchat.booking.com">mchat.booking.com</a>. 550-Message blocked - Please \
check settings. See 550 <a \
href="http://support.digitalwest.net/KB/a163/550-spf-not-allowed-to-send-mail.aspx">http://support.digitalwest.net/KB/a163/550-spf-not-allowed-to-send-mail.aspx</a> \
(in reply to RCPT TO command))<br></div><div><br></div><div>Is my only option here to \
do something like SRS or can this be fixed another \
way?</div><div><br></div><div><br></div></div>



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