You're giving people wrong ideas with your sloppy wording.

if you don't use MIME, you're not sending email

It is possible to compose Internet messages without MIME, in fact more than half of my outgoing emails are not MIME. Mind that the "E" in the acronym is for "extensions".

Sending email is a different concern.

even if you send through a web interface ( webmail )

It is clear from the problem description that the end user invokes his local desktop mail client through the mailto URI in that Web application.

it must uses MIME on your behalf -- otherwise it isn't email (can't use email addresses)

Email addresses are a different concern. The problem description was about attachments, and we should suppose the addresses in that mailto URI work just fine.

It is clear from the problem description that the end user invokes his local desktop mail client through the mailto URI in that Web application.

No. What does the local-desktop-mail-client have to do with LWP?

You're giving people wrong ideas with your sloppy wording.

On the other hand, you're giving sloppy-question-asker wrong ideas with your hypertechnical but ultimately irrelevant corrections

Irrelevant? MIME stands for Multipurpose Internet Mail Extensions. "Extensions," therefore not part of the core system. The OP needs to send attachments, so it's true that he's going to have to use MIME, but the claim "if you don't use MIME, you're not sending email" is completely wrong, and deserved to be corrected. You most certainly can send email without MIME.

Aaron B.
Available for small or large Perl jobs; see my home node.