Synchronet v3.18b-Win32 (install) has been released (Sept-2020).

Synchronet v3.19a, now under development, requires libarchive-dev to build successfully.

You can donate to the Synchronet project using PayPal.

Relay Outgoing SMTP Mail through Vertrauen

Your ISP restricts or blocks outbound connections to TCP port 25 so you are unable to have the Synchronet Mail Server perform Direct Delivery of email messages to public mail (SMTP) servers which require mail delivery on TCP port 25.

Use Vertrauen's Synchronet Mail Server (on TCP port 587) to relay your outbound Internet mail.


  1. If you do not already have a QWK networking account on Vertrauen, create one.
  2. If running Synchronet Control Panel for Windows, shut it down.
  3. Add RELAY_TX and RELAY_AUTH_PLAIN to the Options key value in the [mail] section of your ctrl/sbbs.ini file. Example: Options = ALLOW_POP3 | RELAY_TX | RELAY_AUTH_PLAIN
  4. Edit the following keys in the [mail] section of your ctrl/sbbs.ini file:
RelayUsername=your BBS's QWK-ID
RelayPassword=your QWKnet account password

Alternatively, if you using Synchronet Control Panel for Windows, you can use the SBBSCTRL:Mail->Configure menu option to make the configuration changes and then hit the 'OK' button:

Synchronet Mail Server configuration for relaying through Vertrauen

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.

This relay service can be terminated for one or all clients for any reason at any time. Most notably, if you send SPAM through Vertrauen, you will lose all access to Vertrauen's services, including this one. Your relayed mail messages are not private and there cannot be any expectation of privacy.

See Also

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