Postfix slow down sending for some ESPs in  transport regex: /@.*hotmail\./ slow: /@.*live\./ slow: /@.*msn\./ slow: /@.*yahoo\./ slow: /@.*aol\./ slow: /@.*btinternet\./ slow: /@.*btopenworld\./ slow: /@.*talk21\./ slow: Block specific IP addresses ...

Step 1: Go to Firewall Configuration (/etc/csf/csf.conf) and add these custom logs (they are at the end of the file): CUSTOM2_LOG = “/var/log/maillog” CUSTOM3_LOG = “/var/log/dovecot-info.log”” – (‘grep -rnw ‘auth ...