I have built another free email service - Simple Mail.
Tech stacks include:
- Postfix - 3.7.11
- Dovecot - 2.3.19.1
- OpenDKIM - 2.11.0
- SquirrelMail - 1.4.23
The following options are set for the systems.
- SPF checks
- DKIM sign and validate
- RBL checks - Spamhaus and Spamcop
- ratelimit - 10 mails per day
- smtpd_sender_login_maps
But the following options are disabled on our systems.
- header_checks_submission - remove sender IP
- managesieve - for filters
- DMARC checks
- sasl auth on port 25
- open ports 143/587
Our goal is to maintain a clean and simple email system. No ads, no privacy violations, no behavior tracking, and no selling of user data. Maintaining a reputable email system requires sustained effort, and we hope to succeed.