Middle email server

[tsimtung]

Hi,
I have a few DA servers using digitalOcean or Kamatera cloud, and I am using them as email servers mainly.
Sometimes, it seems one sender cannot connect to my email server, and so users complained my email server cannot receive email from that sender, I guess it is routing problem.
So I want to setup a middle email server, which is in another network, so that the sender can reach this middle email server first, and then forward to the destination server, then it solves the routing problem.
How to do this?

Thanks,

Stanley

 

[zEitEr]

Hello Stanley,

Thank you for posting. While describing on how to build a SMTP relay is probably going out of the scope of these forums, you might check the following results from Google:

- https://www.google.com/search?q=smtp+relay+site:directadmin.com

There can you find instructions on how to configure Exim to use a remote SMTP relay.

p.s. My guess: you won't solve the issue using a remote SMTP relay. If it is a routing problem, then you might check error logs. They might show a real cause of an issue. Probably you have a destination domain hosted locally, while DNS announces it is on another server.