Do you know how to contact Gmail postmasters to understand why "421-4.7.28 unsolicited mail originating from your IP address." ?

gilperr

New Email
Hello,

Our SMTP server IP has been temporarily blacklisted several times since 3 days and we are still blacklisted by gmail.com SMTP servers :

08:44:55.519 5 SMTP-036987(gmail.com) inp: 421-4.7.28 [IP 15] Our system has detected an unusual rate of
08:44:55.519 5 SMTP-036987(gmail.com) inp: 421-4.7.28 unsolicited mail originating from your IP address. To protect our
08:44:55.519 5 SMTP-036987(gmail.com) inp: 421-4.7.28 users from spam, mail sent from your IP address has been temporarily
08:44:55.519 5 SMTP-036987(gmail.com) inp: 421-4.7.28 rate limited. Please visit
08:44:55.519 5 SMTP-036987(gmail.com) inp: 421-4.7.28 Prevent mail to Gmail users from being blocked or sent to spam - Gmail Help to
08:44:55.519 5 SMTP-036987(gmail.com) inp: 421 4.7.28 review our Bulk Email Senders Guidelines. a7-20020a5d5707000000b00213b939829esi1846557wrv.661 - gsmtp
08:44:55.519 3 SMTP-036987(gmail.com) [1755022] message body rejected, got:421 4.7.28 review our Bulk Email Senders Guidelines. a7-20020a5d5707000000b00213b939829esi1846557wrv.661 - gsmtp

I checked our SMTP logs and we have less than 40 mails to gmail.com servers per day and nobody in our company is sending spam or bulk emails. Furthermore, our domain name is secured by SPF/DKIM/DMARC.
We have passed all tests for our IP on MultiRBL.valli.org - Blacklist, Whitelist and FCrDNS check tool and Email Blacklist Check - IP Blacklist Check - See if your server is blacklisted.

Thanks in advance for your help.

Gil
 
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