My customers are starting to let me know about emails not getting to Gmail from my server. I know in the past many of them set up an Alias address purposefully to forward to their Gmail address. I asked them to not do that as any spam that goes through will be blamed on my server.

Today I was forwarded a bounce email from Gmail saying my email server had been throttled.

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Remote Server returned: '421 4.7.28 Gmail has detected an unusual rate of unsolicited mail originating 4.7.28 from your SPF domain [xxxxxxxxxxxxxxxxxx.org      35]. To protect 4.7.28 our users from spam, mail sent from your domain has been temporarily 4.7.28 rate limited. For more information, go to 4.7.28  https://support.google.com/mail/?p=UnsolicitedRateLimitError to 4.7.28 review our Bulk Email Senders Guidelines. vy9-20020a05620a490900b0077f081e30d0si1342475qkn.657 - gsmtp'

Reporting-MTA: dns;mail.zzzzzzzzzzzzzzzzzz.com

Final-Recipient: rfc822;ssssssssssssssssss@gmail.com

Action: failed

Status: 5.0.0

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How do I go about figuring out how much outgoing traffic is going to Gmail? If I search the logs on SMTP it includes both incoming and outgoing. Is there a way to view only outgoing SMTP?

Additionally, while doing some research on the subject, Google is imposing new delivery requirements for "bulk" (over 5000 emails a month) senders.

On this page, they say any Alias / forwarding sending MUST be accompanied by ARC Authentication.

Does SM have that in place?