Comment 37 for bug 357864

In reply to Comment #36:
> a free text field in composition allows too much scope for
> typos and random idiocy and allowing "From" as a customisable
> field overriding the per-account combo is almost as nasty a
> kludge as creating multiple pseudo-accounts.

The "editable combo box" widget in Win32 and Java caters for exactly such
situations; I hope XUL has one.

Comment #3 gives a scenario where a fixed list is of little help.