Recently migrated to Windows 2003 Exchange Server (new server) from an existing 2000 Exchange. Everything was fine for a few weeks. Yesterday I followed the Microsoft instructions for removing the first server in the site, as we want to retire that server and use it for something else. Made sure there were no more connections to the old server. Since that time yesterday, some e-mails are not being sent. These are always to external addresses, yet other external addresses seem to work fine. If I send a broadcast to all internal users and 10 external users, some of those external user messages will just sit in the SMTP queue and eventually send delay messages and then undeliverable. It is not the same domains. It appears random.
Can anyone help!!??
Can anyone help!!??