im having problems with some mails being held.

im using zimbra 7.2:

$ zmcontrol -v
Release 7.2.1_GA_2790.UBUNTU10_64 UBUNTU10_64 FOSS edition.
in a 3 node installation: ldap, mta, mailbox

this is the errors im receiving:
Jan 17 06:34:34 mtaserver postfix/smtp[15732]: connect to mx1.hotmail.com[]:25: Connection timed out

strangest thing is that this was working during first weeks of installation and now is giving problems.

some questions:

- is MTA node always used for outgoing emails?

- in Global Settings -> MTA -> Web mail MTA Hostnames i can see just localhost, in a multinode environment should this be MAT node?