I am using SmarterMail v12.4 on Windows 2012 Server Standard 64bit (IIS 8.5) with ColdFusion 11 64bit. 2 Xeon 2.4Ghz Processors, 24Gb RAM (16Gb free), plenty of disk space.
Problem #1 - when I reboot the server, the SmarterMail service reports that it is started up, but cannot send mail from outside (like from Outlook on my home computer) until I restart the SmarterMail service. Then everything is OK.
Problem #2 - emails sent from ColdFusion are being sent OK for a while, then they start piling up in the Undeliverable Folder (in CF Mail). Sample from the CF Mail error logs are below.
"Error","scheduler-1","11/11/14","06:38:06",,"javax.mail.MessagingException: Could not connect to SMTP host: mail.mydomain.com, port: 587, response: 421"
If I restart the SmarterMail service, and move the undelivered emails from the Undeliverable folder to the Spool folder in ColdFusion so they attempt to send again, many of them get sent, but then the same thing happens - the connection to SmarterMail gets interrupted and the remaining emails get moved to the Undeliverable folder.
Currently, I have 9000 emails in the Undeliverable folder. Any suggestions on how to fix these problems?