...or at least the problem that came to light recently.
In a MIME message, you can use an "encoded-word" in the header to represent
text that isn't 7-bit ASCII. For example:
From: =?utf-8?q?Ricardo_Juli=C3=ADn_Besteiro_Signes?=
Email::MIME's header method helpfully decodes these into character strings,
so that when you say:
$email->header('from');
...you get JuliÃÆán in there, not some MIME crap.
The header method is used to stringify the message. This means that when you
load in a safe, 7-bit MIME message and then stringify it, you get an 8-bit
(wide-character-having) string that can't be safely sent over plain old SMTP.
Maybe this wasn't a problem back when Email:: modules were more brazen about
assuming that each others' internals would never change, and only became a
problem when I started making them rely on methods rather than guts.
Either way, this is a pretty big problem. It means you can't reliably do:
Email::Send->send($email_mime->as_string);
Oops.
