gmail blacklist
sample error
Diagnostic-Code: smtp; 421-4.7.0 [x.x.x.x 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 421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review our Bulk 421 4.7.0 Email Senders Guidelines. a10si2764006vdt.52 - gsmtp
- http://www.google.com/mail/help/bulk_mail.html
- https://support.google.com/mail/troubleshooter/2920052#ts=2920085,2923810
- http://www.blacklistmonitoring.com/lookup/run_blacklist_lookup_tool.php
host -t mx gmail.com
Aug 1 10:33:10 mailserver postfix/smtp[7122]: 562172C0209: to=<sample@gmail.com>, relay=alt1.gmail- smtp-in.l.google.com[74.125.29.26]:25, delay=2.8, delays=0.1/0.02/2/0.68, dsn=4.7.0, status=deferred (host alt1.gmail- smtp-in.l.google.com[74.125.29.26] said: 421-4.7.0 [x.x.x.x 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 421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review our Bulk 421 4.7.0 Email Senders Guidelines. w16si11499334qaw.13 - gsmtp (in reply to end of DATA command))