u r not alone!
for me it isn't working too.
Clean Install of Ubuntu 10.04.4 LTS + Zimbra 7.2
No chance to create an external account, doesn't matter pop/s | imap/s.
On other hosts it works but they were updated. Not a clean install.
Firewall is open. Telnet works:
i played with following options + restart of zimbra:
zimbra@zimbra:/$ telnet mail.einfachmailen.de 995
Connected to mail.einfachmailen.de.
Escape character is '^]'.
Connection closed by foreign host.
any ideas more?
zmlocalconfig -e ssl_allow_accept_untrusted_certs=true;
zmlocalconfig -e data_source_trust_self_signed_certs=true ;
zmlocalconfig -e javamail_imap_enable_starttls=false;
zmlocalconfig -e javamail_pop_enable_starttls=false;
zmlocalconfig -e javamail_pop_enable_ssl=false;
zmlocalconfig -e javamail_imap_enable_ssl=false
the mail settings were tested on another zimbra 7.2 server and the work!?!?!