Introduction to Outgoing IPs By default, when your mail server sends out email the SMTP connection will come from the system’s default IP address, typically that assigned to eth0 . Even if ...

You can insert invisible pre-header text into your emails so it won’t show up in the body of your message, but still be visible in the message preview. How to ...

transport_maps = hash:/etc/postfix/transport create /etc/postfix/transport in the format of domain.com smtp:smtp.mailchannels.netdomain2.com smtp:smtp.mailchannels.net add to main.cf: smtpd_sasl_authenticated_header = yes service postfix restart

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 ...

List of Email Bounce Codes Code Summary Description 2.XXX.YYY Success Success specifies that the DSN is reporting a positive delivery action. Detail sub-codes may provide notification of transformations required for ...