Frank Millman wrote:
Assume our domain name is example.com, and our email addresses are
f...@example.com, b...@example.com, etc.

In main.cf, I had the following -

myhostname = fcserver.example.com
mydomain = example.com
myorigin = $mydomain

I have now changed it to -

myhostname = example.com
mydomain = com
myorigin = $mydomain

It now works, but I don't know why. I thought my domain name was
example.com, and each machine on the network should have a host name of
{host}.example.com.

Please can someone explain where I went wrong.

Please post the output of postconf -n of the working config and non-working config. The above really isn't enough to figure out what your problem is/was.

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