SMTP server for Linux with simple configuration
I'm looking for a simple SMTP server that I can run without too much installation hastle and that which can also support TLS.
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These are too few requirements that have to be fulfilled. But the one and only answer to that question is Postfix. It's the only server - that I know of - which ships with a working and secure preconfiguration.
Postfix and others are simple. This is what the S in SMTP stands for. And I don't know of any aspect of SMTP that Postfix can't do.