We got a Plesk VPS with Spry recently and have moved some applications to it. One of the applications makes use of the PHP mail() function. However, it appears that the mail is getting stuck in the Queue. There are now nearly 200 messages in there ranging from nearly 5 days old to a few hours old.

This is driving me nuts. We moved to this VPS so we wouldn't have these issues. Our previous host throttled the account to only allow so many messages per minute/hour etc. It was very frustrating.

If anyone has any ideas how to kick Plesk's SMTP system into gear, I would appreciate it.

I have already done the following:
1. Logged into the vps and went to Mail in the server section and verified the settings.
2. Restarted the SMTP service in Service Management.