- Is it misspelled?
- Does it violate the rules of grammar?
- Does it offend my sense of style?
- Is. It. Punctuated. Idiosyncratically?
- Does it violate IETF RFCs 2047 and 2231 by placing un-encoded non-ASCII characters in any of the message headers?
If any of the above are true, the recipient SHOULD send a delivery status notification stating the reason for the delivery failure. The recipient MAY prefer to discard the message.
What Outlook does instead is ask one to select those countries, languages, and encodings which you find unacceptable. I can’t do that. It’s a small world after all. But I can be pedantic and insist that mail be well-formed.
Sorry, Mr. Postel.