Scott Talbert:
> On Sun, 9 Jul 2017, Wietse Venema wrote:
> 
> >> Jul  7 23:10:57 bear postfix/smtp[29598]: 92F8422A0C90: to=<a...@xyz.com>,
> >> relay=aspmx.l.google.com[2607:f8b0:400d:c0b::1a]:25, delay=0.65,
> >> delays=0.13/0/0.29/0.22, dsn=5.7.1, status=bounced (host
> >> aspmx.l.google.com[2607:f8b0:400d:c0b::1a] said: 550-5.7.1
> >> [2607:f308:1:1::2      12] Our system has detected that this message
> >> 550-5.7.1 is likely unsolicited mail. To reduce the amount of spam sent to
> >> 550-5.7.1 Gmail, this message has been blocked. Please visit 550-5.7.1
> >> https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1  for
> >> more information. o74si4960796qkl.67 - gsmtp (in reply to end of DATA
> >> command))
> >
> > Was your mail really sent from 2607:f308:1:1::212? According to DNS,
> > your primary MX is bear.techie.net, with IP addresses 205.134.185.202
> > and 2607:f308:1:1::2.
> >
> > If may be worthwhile to fix the SMTP client IP address with
> > "smtp_bind_address6 = 2607:f308:1:1::2", at least for off-site
> > email.
> 
> No, it's sent from 2607:f308:1:1::2.  I don't know what the extra spaces + 
> 12 after the IP address mean in that error report from gmail.

How do you know?  Did you record the packets?

I know that your primary MX service is not reachable on 2607:f308:1:1::2,
but it is reachable on 205.134.185.202.

    % telnet 2607:f308:1:1::2 smtp
    Trying 2607:f308:1:1::2...
    ^C
    % telnet 205.134.185.202 smtp
    Trying 205.134.185.202...
    Connected to bear.techie.net.
    Escape character is '^]'.
    220 bear.techie.net ESMTP Postfix (Ubuntu)
    quit
    221 2.0.0 Bye

This would not be the first time that some IPv6 stack grabs an
unexpected IPv6 address.

        Wietse

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