Help to Block Spam (ingoing and forwarded)

[mattewre]

Hi,
I'm currently using Ubuntu 14.04 with a stock Sentora installation. Everything is working fine and it is easy to use even in I'm not expert.
Now I'm facing a problem. I set up the mailboxes (+ many alias) for each domain and I'm redirecting everything to an external Gmail box.
My server provider (OVH / Kimsufi) is blocking my 25 smtp port since my server is detected to send spam, and it could be true since I'm receiving forwarding all the mails I'm receiving.

I would like to filter and discard the suspicious mail I receive on the server, before forwarding to Gmail.
What is the easier way? That doesn't require too much configuration?
I don't care about false positive (usually I don't receive important mail on these mailboxes) so I don't need an advanced spam filter.

Thank you

[apinto]

I do have a similar setup as you, had a similar problem with Gmail.
Forwarding to Gmail is NOT EASY thing to do, you should vmake sure you do not forward too much spam or Gmail will block your server / domain (that is much worse than OVH blocking port 25).

As for a workaround, try to setup gmail to fetch via POP instead of forwarding, that should solve your issue.

[apinto]

Check Amavis, but honestly I'm not very experienced on setting up amavis / spamassassin.