Postfix outbound SMTP via TOR Hidden Service

  • 13 June 2014

I have been looking to link my portable Postfix on my laptop with another Postfix reachable by a TOR Hidden Service. I did some tinkering with TCP proxies, stunnel and other setups. Yesterday I found the article SMTP over Hidden Services which will do the trick. The description uses Postfix’ transport map to send  individual domain via the SMTP Hidden Service uplink. If you want all e-mails for all domains to go through the SMTP link, use the line

*   smtptor:[78uhrgdnsawillgetyoughe746.onion]

in your transport map after the .onion line. Works like a charm. The only downside is that I had to give up server certificate verification, but this can be done in a separate setup on the server side.

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