[Imap-protocol] [noob] fetch envelope charset?

Timo Sirainen tss at iki.fi
Sun Nov 20 08:22:30 PST 2011


On 20.11.2011, at 16.48, Petite Abeille wrote:


> Given a fetch envelope command, what character set encoding can the response be in?

>

> For example, say the subject is originally encoded as =?iso-8859-1?Q?H=F3la!?=, which is Hóla! in UTF-8.

>

> What can one put in the subject part of the envelope?

>

> Does it have to be the original value (=?iso-8859-1?Q?H=F3la!?=)?


This is what all servers I know of do.


> Could it be the literal UTF-8 value (Hóla!)?


Not without IMAP UTF8 extension enabled.


> Could it be the q-encoded UTF-8 value (=?UTF-8?Q?H=C3=83=C2=B3la!?=)?


I suppose it could be.


> Could it be the UTF-7 encoded UTF-8 value (H+APM-la+ACE-)?


No.


> I'm really confused about what character set encoding IMAP is expecting and where. Is there perhaps a FAQ to complement the RFC that summarizes what applies where?


Mailbox names are mUTF7, SEARCH command has an optional CHARSET parameter, elsewhere there are no charset conversions.


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