Problems with mail lists/aliases/group redirects to gmail users

Is anybody else seeing frequent gmail rejections of mails redirected to 
gmail users?

I started noticing this about three weeks ago seeing log entries like:

11:21:22.799 4 SMTP-000037(gmail.com) rsp: 354  Go ahead 
hx4si17992894pac.303 - gsmtp
11:21:24.832 4 SMTP-000037(gmail.com) rsp: 421-4.7.0 [50.193.60.236 15] 
Our system has detected an unusual rate of
11:21:24.832 4 SMTP-000037(gmail.com) rsp: 421-4.7.0 unsolicited mail 
originating from your IP address. To protect our
11:21:24.832 4 SMTP-000037(gmail.com) rsp: 421-4.7.0 users from spam, 
mail sent from your IP address has been temporarily
11:21:24.832 4 SMTP-000037(gmail.com) rsp: 421-4.7.0 rate limited. 
Please visit
11:21:24.832 4 SMTP-000037(gmail.com) rsp: 421-4.7.0 
https://support.google.com/mail/?p=UnsolicitedRateLimitError to
11:21:24.832 4 SMTP-000037(gmail.com) rsp: 421 4.7.0 review our Bulk 
Email Senders Guidelines. hx4si17992894pac.303 - gsmtp
11:21:24.832 3 SMTP-000037(gmail.com) [65250101] message body rejected, 
got:421 4.7.0 review our Bulk Email Senders Guidelines. 
hx4si17992894pac.303 - gsmtp


This even though the supposed "offending" server in question is my 
personal hobbyist server and sends an average on of maybe 50-60 emails 
to gmail users on a given day. This is the same pattern my server has 
had for years without problems to gmail.

I asked a Google engineer about this a few weeks ago. He suspected a bug 
in some new "aggressive anti-dkim replay rule" and filed a bug with 
gmail's spam team. The problem went away for a few weeks, but is now 
back with a vengeance.

I'm just wondering if anybody else is seeing this?

It's starting to look an awful like Yahoo's harsh DKIM implementation 
which permanently broke legions of mail lists and forwarders the world over.



--Mike

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