I just realized that a bunch of people have commented on a post and I wasn't getting any email notifications for it (as I usually do). So, I went into my server and sure enough, there were dozens of emails in my undeliverable mail folder. I then went into my ColdFusion Administrator and viewed my mail logs and saw this error many times in a row for CFMail:
The ColdFusion Mail Spool Encountered An Invalid Spool File In The Spool Directory. The invalid file MailXXXXXX.cfmail was moved to the undeliverable directory.
What's strange is that I am getting some of the emails, but not all. After doing some quick Googling, I came across a post on MXimize.com. In the comments of that post, Gary Fenton points out that this is a known problem with ColdFusion 8.0.1. Apparently, there is a hotfix for it, but as of May 16th, 2008, it was not yet released publicly. I checked the latest hotfix, but none of the issues address are CFMail related.
The end result of this, though, is that I just got dozens of emails (after moving cfmail files into the Spool folder); so, sorry if I didn't get back to you yet.