Or, will less zeros ....
tcping -t 1 imap.gmail.com
993 :-) :-)
Specifically what's going on here is that fedora netcat is not the old
netcat you know.
A little while back (I don't remember which release) it was replaced by
nmap netcat (ncat):
[root@server ~]# rpm -qf /usr/bin/nc
This does not have the old -z option as you mention... tcping is the best
of the options others have presented (no idea what that person was going on
about netstat for...)
The other alternative to tcping is nmap ...
nmap -Pn -p993 imap.gmail.com