It seems that I solved the problem. As I suspected the hostname of "server.e-sol" causes troubles.
I replaced "server.e-sol" with "server.e-sol.biz" in
/etc/hosts
/etc/hostname
/etc/courier/imapd.cnf
/etc/courier/pop3d.cnf
then executed
mkimapdcert
mkpop3dcert
and restart the server
The web sites are working and mails are sent and received.
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