Swaks doesn't support socks proxies yet. The only proxy it supports is the PROXY protocol. It's definitely on the list to explore, I'll leave this open as a wishlist item.

Thanks for opening a github issue, BTW. I was just toying with using them for issue management two days ago, this will be a good experiment.

@jetmore - if you publish the code here, it could also be a community developed feature. Thanks for the great utility!

Also requested by devio.us#jirib 2012-01-04:

I've been looking for a smtp client which could work via
socks (helpful with Tor). As I haven't found any such client,
I've found 'socat' contains a script which could then talk
to a remote SMTP server with help of 'socat'.

As script is not fully OK for me, I have found `swanks', as
probably only smtp client being able to talk to a SMTP
server via pipes/sockets ;)

If I could raise a feature request I would vote for
a "native" socks/http proxy support.

See PR #19 for example implementation