Direct Logic writes:
Thanks Sam,i want to do the following setup Main courier Server <---> Secondary Courier Server <---> ClientI want user connect with Secondary courier server to fetch mails and secondary server contact with main server and fetch mail on behalf of client and deliver mails to client with a copy of all mails in secondary server as well.
Although there are several different ways to do that, you should, instead, explain what problem you're trying to solve. Quite often, instead of explaining what the problem is, one thinks that there's only one way to solve a problem, and tries to figure out how to do that, when there's really a better, different way to solve the problem that's going to work much better.
But, to narrow down the answer precisely to this, the best way would be to use mail aliases. See "ALIAS SPECIFICATIONS" in the makealiases man page. An alias entry of "address1: address2, address3" forwards mail addressed to one address to two different address, and you'll just need to carefully configure domains, host names, and server configuration to end up with the desired results.
So, with a mail domain of @example.com, and two servers host1.example.com and host2.example.com, each server would configure example.com as a hosted domain, with each host's name, and a local domain, set to host[n].example.com.
Then, on host1, it's a matter of defining aliases of the form "u...@example.com: user, u...@host2.example.com", so each mail gets forwarded to a local mailbox, and to the same mailbox on host2.example.com. That's it.
But, you're probably trying to solve a completely different problem, for which a better solution probably exists, as I said.
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