Gmail throttling?

[ops.lists at gmail.com (Suresh Ramasubramanian)]

Auto forwarded mail is like that. Any inbound spam your users receive also
gets forwarded. So...
On 22-Feb-2014 1:00 AM, "Eduardo A. Su?rez" <
esuarez at fcaglp.fcaglp.unlp.edu.ar> wrote:

> Hi,
>
> some of our users have forwarded the email to Gmail and Gmail now are
> complaining that this is bulk mail and delaying it.
>
> We have SPF, DKIM, DMARC, even SRS to try these things do not happen :(
>
> Anyone know if there is any new policy in Gmail about that?
>
> Above all, the message refers to a non-existent URI!
>
>  RSET
>>>>
>>> 250 2.1.5 Flushed v69si8136768yhd.33 - gsmtp
> <xxxx at gmail.com>... Using cached ESMTP connection to
> gmail-smtp-in.l.google.com. via esmtp...
>
>> MAIL From:<xxx at example.com> SIZE=150374 BODY=8BITMIME
>>>>
>>> 250 2.1.0 OK v69si8136768yhd.33 - gsmtp
>
>> RCPT To:<xxxx at gmail.com>
>>>> DATA
>>>>
>>> 250 2.1.5 OK v69si8136768yhd.33 - gsmtp
> 354  Go ahead v69si8136768yhd.33 - gsmtp
>
>> .
>>>>
>>> 421-4.7.0 [163.10.4.2      15] Our system has detected an unusual rate of
> 421-4.7.0 unsolicited mail originating from your IP address. To protect our
> 421-4.7.0 users from spam, mail sent from your IP address has been
> temporarily
> 421-4.7.0 rate limited. Please visit http://www.google.com/mail/
> help/bulk_mail.
> 421 4.7.0 html to review our Bulk Email Senders Guidelines.
> v69si8136768yhd.33 - gsmtp
>
>> QUIT
>>>>
>>>
>
> Eduardo.-
>
>
> --
> Eduardo A. Suarez
> Facultad de Ciencias Astron?micas y Geof?sicas - UNLP
> FCAG: (0221)-4236593 int. 172/Cel: (0221)-15-4557542/Casa: (0221)-4526589
>
>
> ----------------------------------------------------------------
> This message was sent using IMP, the Internet Messaging Program.
>
>
>