I have a Windows 2003 server that publishes our website using IIS 6. Its been running fine for years. Starting on 06-25-09 we stopped receiving emails from the contact form on the website. This Windows server also is running Coldfusion Server 4.51 (i know, its old) which sends mail from the CF forms on the web site to the IIS SMTP mail server thats on the same box.
The CF Mail Log says:
Error","TID=1796","07/02/09","15:43:07","Failed to send the spooled mail file, E:\CFUSION\MAIL\spool\8.cfmail. SMTP server replied "Unable to connect to mail server." Moved file to E:\CFUSION\MAIL\undelivr\24.cfmail."
The message sits in this folder: E:\CFUSION\MAIL\SPOOL and eventually goes to the CF undeliverable folder. Unless i restart all 3 CF services (Application Server, Executive & RDS). Then it will process any mail that its been holding but wont send anymore until i restart the services again or reboot.
This all worked fine a week ago. There were 2 security updates from Microsoft on the day it stopped working, KB961063 - DNS patch and KB963707 - .Net 3.5 update. I uninstalled both of those and cold booted the server but it does the same thing. If I go into the CF Admin and have it verify the mail server connections it verifies ok?!?!
Also this same server has a few scripts that monitor folders and send out emails when a file is dropped in them. All of those emails continue to work fine with the same SMTP server being used and the same recipients.
I dont know what to look for next. any ideas?