[nantes]

Where does it say that it sits behind HTTP?

The only bit I see that talks about something similar is, "Salmon is designed to sit _behind a traditional mail server_ in the same way a web application sits behind Apache or Nginx", emphasis is mine.

[rubinelli]

It would be nice if the documentation had some examples of how to do that, though. All it says is this:

> Salmon is best deployed behind another mailserver such as Postfix or Sendmail - much in the same way as you host a WSGI application behind Apache or Nginx.

[icebraining]

If you search for "[mailserver] lmtp forward", it's not hard to find. For example, here's a configuration for Exim: https://wiki.dovecot.org/LMTP/Exim#Using_LMTP_over_TCP_Socke...