Viktor Dukhovni:
>
> > On Jul 9, 2017, at 11:39 AM, Scott Talbert <s...@techie.net> 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
...
> >> 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.
>
> Likely Google sees your address as 2607:f308:1:1::212, but long SMTP replies
> get folded across multiple lines, and unfolded with the whitespace you
> observe.
Here is an example from a few posts ago in this thread, with long
lines broken with backslash-newline for readability.
Jul 9 08:43:06 mail postfix/smtp[18059]: C95E4849A: to=*, \
relay=gmail-smtp-in.l.google.com[2607:f8b0:400d:c0b::1b]:25\
, delay=1.3, delays=0.29/0.04/0.53/0.46, dsn=5.7.1, status=\
bounced (host gmail-smtp-in.l.google.com[2607:f8b0:400d:c0b\
::1b] said: 550-5.7.1 [2001:19f0:5:752:f000:: 1] Our \
system has detected an un...
Note the spaces inside the IPv6 address.
You can convince yourself with tcpdump, or set "smtp_bind_address6
= 2607:f308:1:1::2" and see if that makes a difference.
Again, it would not be the first time that some IPv6 stack grabs
an unexpected IPv6 address.
Wietse
