The Lounge is rated PG. If you're about to post something you wouldn't want your
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questions and please don't post ads.
I am sometimes irked by the poverty of content of some error messages (including mine), but I consider that those related to e-mails deserve a special mention.
Here is a cool example of the info you get in return when sending a mail with several attachments of different kinds. The messages are provided in two separate files.
The best of the story is that you are not just bombarded with all that useless crap, you also don't get any clue about the things that really matter to you: 1) what file or file extension was blocked ? 2) was the message delivered at all ?