Problem with Blogger Email Publishing

I set my blog on Blogger to enable publishing via email (nice feature). Works great. I like it.

However, I received an erroneous message from their mail server saying that the mail was undeliverable ... yet, the mail that the server says is undeliverable was indeed published. I reported this to Blogger Support.

Their reply:

Thank you for writing in and reporting this problem. You might want to try changing the secret word in your mail-to-blogger address to see if your problem continues.

Please see our Blogger Help article for more details:
http://help.blogger.com/bin/answer.py?answer=135&topic=38