On Wed, 2017-11-08 at 12:20 -0700, Warren Volz wrote:
> All,
>
> One of my users has their account setup to forward mail to Gmail.
> Recently I've started to see lots of rejects that look like the
> following:
>
> <us...@gmail.com> (expanded from <us...@somelocaldomain.net>): host
> gmail-smtp-in.l.google.com[2607:f8b0:400e:c04::1a] said: 550-5.7.1
> [ipv6 address 18] Our system has detected that
> 550-5.7.1 this message is likely suspicious due to the very low
> reputation
> of 550-5.7.1 the sending IP address. To best protect our users from
> spam,
> the 550-5.7.1 message has been blocked. Please visit 550 5.7.1
> https://support.google.com/mail/answer/188131 for more information.
> p26si2014836pli.781 - gsmtp (in reply to end of DATA command)
>
> I've looked over the forwarding best practices provided by google and
> we are not modifying the envelope sender. I'd rather not start
> throwing away what our filter marks as spam since I leave that up to
> the user, but is that the only way to stop the bounces? Also, is the
> "18]" an artifact or some kind of error?
>
> Thanks for the help.
IMO, you really can't forward mail to Gmail; they will block you if you
forward any spam at all.
Gmail accounts can be setup to pull mail in via POP-3, that's a far
better way for them to get their mail.
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