Proxy everything to another SMTP server

[jesucarr]

I'd like to authenticate and send emails using my SMTP provider but using my Haraka installation as SMTP server. So for example one of my users have this login details:

host: smtp.myprovider.com port: 25 user: mylongkey password: mylongkey TLS: yes

Now I want to be able to change it to:

host: smtp.myharakainstall.com port: 25 user: mylongkey password: mylongkey TLS: yes

I had a look to the auth_proxy plugin, but apparently it needs the user in user@domain format, but my user is a long key.

I also had a look to the smtp_proxy plugin, but apparently I need to specify the login details, but I need to use whatever login details the user is using.

So basically I use my own host name, and the rest is authenticated and sent to my provider.

Is this possible with Haraka?

[smfreegard]

Will all of your users be using the same provider? e.g. smtp.myprovider.com from your example.

[smfreegard]

Oh - and this would only be handling outbound mail mail - right? e.g. your users would be using Haraka as their outgoing SMTP server, you wouldn't want it to also act as an MX for any of your domains.

[jesucarr]

Exactly. Same provider for all, just different username/password, and only outgoing SMTP.

[smfreegard]

You'd have to customize auth_proxy a bit - something like this (untested): https://gist.github.com/smfreegard/42ecb455dcd61f8e6bb9

Then you'd need a plugin like this to override the MX and to set the same AUTH user and password: https://gist.github.com/smfreegard/aeb9e218d7f6106bab1d

You'd put both those plugins in /path/where/you/installed/Haraka/plugins, then add them both to /path/to/where/you/installed/haraka/config/plugins (you can remove everything else from this file)

Then do: echo smtp.myprovider.com > /path/to/where/you/installed/Haraka/config/proxy_host

Start-up Haraka and try it. If it works, it will authenticate you against smtp.myprovider.com and if successful, will allow you to send a mail at which point it will accept the mail and then deliver it to smtp.myprovider.com using the same credentials.

If it doesn't work - then you get to debug it and work out why it doesn't work ;-)

[jesucarr]

Thanks a lot for your help. It works perfectly.

I think this can be useful for others, so I created a plugin with your solution and sent a PR: https://github.com/haraka/Haraka/pull/1326

Hope makes sense