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.

In reply to Re^2: Sending a email with file attachment with LWP ONLY by daxim
in thread Sending a email with file attachment with LWP ONLY by MarkusH

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