[exim] changed my server host name, but exim still returns t…

Hi,

I'm puzzled, I've changed my server's host name, and even recompiled exim
and rebooted the server, but when I try to test with either 'telnet
localhost 25' or 'telnet 192.168.123.123 25' exim returns the OLD FQDN
(hostname).

When I give any of these commands, 'hostname', 'hostname -d' and
'hostname -f', I get the NEW hostname, and in my hosts file is also only the
new hostname.

Why is exim (4.43) returning the OLD hostname when I telnet 25?

Thanks much for your help,
Robert