I've been seeing a large increase in Gmail rate limiting errors this week. So 
far today has been the worst.

421 4.7.0 [xxx.xxx.xxx.xxx 10] Our system has detected an unusual rate of 
unsolicited mail originating from your IP address. To protect our users from 
spam, mail sent from your IP address has been temporarily rate limited. Please 
visit http://www.google.com/mail/help/bulk_mail.html to review our Bulk Email 
Senders Guidelines.

Anyone else seeing an increase in these errors? The mail is going through but 
about 5-10x slower than usual.

We use rules to prevent us from sending a lot of mail when we see this error 
from Gmail but from my data it's becoming more widespread. Looks like it 
started Tuesday Evening through Wednesday. It wasn't bad yesterday but today 
I'm seeing 100's of client IPs affected by it. Can't seem to find any common 
patterns. All different IP ranges and MFROM domains. Both from very active 
senders to brand new senders on new IPs. Shared and Dedicated IP are both 
affected.

Regards,
Andrew


Andrew D. Wingle
Principal Delivery Strategist

717-627-4528 x318
717-625-7857 direct
[email protected]<mailto:[email protected]>
www.listrak.com<http://www.listrak.com/>

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