Email

Antispam

• New Gmail protections
• google email sender guidelines
• google DKIM
• yahoo AOL email sender

SMTP

• How to Choose the Right SMTP Port (Port 25, 587, 465, or 2525)
• Still Confused With SMTP Ports? Read This

Mail server (postfix)

• CAN-SPAN ACT compliance guide
• Spamhaus SBL Policy
• DMARC validation system

Postfix

• https://willem.com/blog/2019-09-10_fighting-backscatter-spam-at-server-level/
• prevent open relay
• postfix - users are geting mail from them self that they did not send
• enable SASL postfix
• Postfix SASL howto
• Debian postfix anti Span
• Postfix reject RBL
• Running a mail server (linode)
• Postfix and SASL
• Hardening Postfix
• Postfix-Cyrus-Web
• Test SASL
• How To Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 20.04
• DMARC Postfix Setup
• Set Up OpenDMARC with Postfix on Ubuntu to Block Email Spoofing/Spam