- Send Policy Framework - SPF Records
- SPF Tools
- Microsoft Sender ID Framework Wizard
- The SMTP Protocol
- SMTP Inside Out
telnet (ip address or name) 25 EHLO MAIL FROM:user @ some.tld RCPT TO:test @ some.tld DATA Subject: This is an SMTP Test This is a test of the SMTP server. Please reply if you get this email. Russell . QUIT You will need to copy to Notepad first, modify (removing extra spaces from email addresses, then paste...Depending on which device you are sending the test to, you may need to replace the EHLO command with HELO. |
Other Items:
- MXToolbox - This is a free!
- MailScanner - Free AV and Spam filter (Linux based)
- Proxmox Mail Gateway - AV and Spam filter (Free edition and will work as a Virtual Appliance)



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