On Tue, Oct 16, 2012 at 11:10 AM, Steven Tardy sjt5@its.msstate.edu wrote:
is any email program running? run: netstat -pant|grep ":25"|grep LISTEN to see if any program is listening... output should look like: tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 21493/sendmail
guess it'll say 'postfix' or 'master' instead of 'sendmail' on RH6.
How long are you waiting for a response to appear? Mailers do an assortment of reverse-dns lookups and perhaps an ident query to the source before responding. If you firewall these with a 'drop' instead of 'reject' you leave the application hanging for fairly long timeout. And some mailers have a config option for an intentional delay before their first message and will drop the connection it the other end sends first (snmp protocol requires the connecting host to wait). Also, you should have something showing up in /var/log/mailllog about the connections.