Synchronet v3.21e-Win32 (install) has been released (Mar-2026).

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howto:relay_smtp [2017/03/06 11:12] – digital manhowto:relay_smtp [2023/06/16 15:33] (current) – [Relay Outgoing SMTP Mail through Vertrauen] Add SCFG v3.20 example digital man
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 **Problem:**\\ **Problem:**\\
 Your ISP restricts or blocks //outbound// connections to TCP port 25 so you are unable to have the Synchronet [[server:Mail]] Server perform //Direct Delivery// of email messages to public mail (SMTP) servers which require mail delivery on TCP port 25. Your ISP restricts or blocks //outbound// connections to TCP port 25 so you are unable to have the Synchronet [[server:Mail]] Server perform //Direct Delivery// of email messages to public mail (SMTP) servers which require mail delivery on TCP port 25.
 +
 +**Problem:**\\
 +Some public mail services (e.g Gmail) reject email messages from your server due to a blocked/untrusted IP address or lack of a "SPF TXT" DNS record that authorizes mail to be sent from your mail server for your hostname.
  
 **Solution:**\\ **Solution:**\\
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 Note: the "Use Relay Server" radio button must be checked on the "SendMail" tab for the "Relay" tab shown above to appear in the configuration dialog box. Note: the "Use Relay Server" radio button must be checked on the "SendMail" tab for the "Relay" tab shown above to appear in the configuration dialog box.
 +
 +Or... in [[util:SCFG]] v3.20+, in Servers->Mail Server->SendMail Thread...
 +<code>
 +╔═════════════════════════════════════════════════╗
 +║                 SendMail Thread                 ║
 +╠═════════════════════════════════════════════════╣
 +║ │Enabled                       Yes              ║
 +║ │Rescan Interval               1 hour           ║
 +║ │Connect Timeout               10 seconds       ║
 +║ │Auto-exempt Recipients        Yes              ║
 +║ │Max Delivery Attempts         50               ║
 +║ │Delivery Method               Relay            ║
 +║ │Relay Server Address          mail.synchro.net ║
 +║ │Relay Server TCP Port         25               ║
 +║ │Relay Server Authentication   Plain            ║
 +║ │Relay Server Username         your-qwk-id      ║
 +║ │Relay Server Password         pass             ║
 +╚═════════════════════════════════════════════════╝
 +</code>
      
 **Policy:**\\ **Policy:**\\

Trace: