hi we migrated to a new server with new IP's all with good reputation and NOT blacklisted anywhere, but yet all my clients trying to send emails that are handled by messagelabs.com gets a timeout message. even the ones that are in a conversation back and forth for a while.
one example:
LOG: MAIN
cwd=/usr/local/cpanel/whostmgr/docroot 6 args: /usr/sbin/exim -C /etc/exim_outgoing.conf -v -M 1cZxGa-00014g-6j
delivering 1cZxGa-00014g-6j
Connecting to cluster8.eu.messagelabs.com [85.158.140.211]:25 ... failed: Connection timed out (timeout=5m)
LOG: MAIN
H=cluster8.eu.messagelabs.com [85.158.140.211] Connection timed out
Connecting to cluster8.eu.messagelabs.com [85.158.139.19]:25 ... failed: Connection timed out (timeout=5m)
LOG: MAIN
H=cluster8.eu.messagelabs.com [85.158.139.19] Connection timed out
Connecting to cluster8.eu.messagelabs.com [85.158.140.195]:25 ... failed: Connection timed out (timeout=5m)
LOG: MAIN
H=cluster8.eu.messagelabs.com [85.158.140.195] Connection timed out
Connecting to cluster8.eu.messagelabs.com [85.158.139.51]:25 ... failed: Connection timed out (timeout=5m)
LOG: MAIN
H=cluster8.eu.messagelabs.com [85.158.139.51] Connection timed out
Connecting to cluster8.eu.messagelabs.com [85.158.137.19]:25 ... failed: Connection timed out (timeout=5m)
LOG: MAIN
H=cluster8.eu.messagelabs.com [85.158.137.19] Connection timed out
Connecting to cluster8a.eu.messagelabs.com [216.82.251.230]:25 ... failed: Connection timed out (timeout=5m)
LOG: MAIN
H=cluster8a.eu.messagelabs.com [216.82.251.230] Connection timed out
LOG: MAIN
== ffredericks@slrconsulting.com R=dkim_lookuphost T=dkim_remote_smtp defer (110): Connection timed out
our mail IP address is: 75.102.22.82
some did go through after a day or so, but now they still sitting in our mail queue for a few days now.