i had VPS server and it was attacked by hacker and used it in send thousend of spam mail , i discover that late and remove the script used for that but now when i used my server for used my community mail the server not send most of mails I run the following command from ssh tail -500 /var/log/exim_mainlog And get the following error " SMTP error from remote mail server after end of data: host alt2.gmail-smtp-in.l.google.com [173.194.78.26]: 421-4.7.0 [209.217.***.*** 15] Our system has detected an unusual rate of\n421-4.7.0 unsolicited mail originating from your IP address. To protect our\n421-4.7.0 users from spam, mail sent from your IP address has been temporarily\n421-4.7.0 rate limited. Please visit\n421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review our Bulk\n421 4.7.0 Email Senders Guidelines. p2si3595848wjy.149 - gsmtp " SMTP error from remote mail server after MAIL FROM:<*****@server.*****.net> SIZE=2918: host mx3.hotmail.com [65.55.33.119]: 421 RP-001 (COL0-MC5-F35) Unfortunately, some messages from 209.217.***.**5weren't sent. Please try again. We have limits for how many messages can be sent per hour and per day. You can also refer to Troubleshooting. "" The question Know how ican remove my IP address from Google and hotmail