On Mon, Oct 12, 2009 at 09:18:46AM -0400, Wietse Venema wrote:
> - CHUNKING has no benefits for Postfix. The SMTP daemon just has
> to do more work transforming the blobs into the canonical Postfix
> queue file format.
>
> - BINARYMIME is no good for digital signatures such as DKIM until
> every MTA deploys it. When used as submission-only protocol it has
> no benefits for Postfix. The SMTP daemon just has to do more work
> when it transforms blobs into canonical Postfix queue file format.
Both of these are to reduce client-side bandwidth requirements when
transmitting binary attachments (images, video, ...). I guess some
believe the 25% bandwidth reduction to be worth the cost of supporting
these mechanisms.
Indeed on the Postfix side, such content would need to be immediately
converted into 8-bit MIME (before cleanup). Not a small change.
> - BURL adds an IMAP client to the MTA.
I see a failure to do the work in the right place. They already add a
CATENATE feature to IMAP, that allows the client to create messages out
of various chunks of content already present on the IMAP server. What's
missing is support for the IMAP server to *send* the message in question.
Adding an IMAP client to SMTP, seems like a rather expensive way to move
content from the IMAP store into messages...
Marshall T. Rose's original POP server had an an extension for message
submission, I think this is where such features belong.
I am surprised to see a design where SMTP servers have to reach out
and grab content out of IMAP servers, with the complexity of transient
authentication tokens, ... Submission via IMAP is a hell of a lot simpler,
because the IMAP server already has all the content in question, and
gets copies of new mail in "Draft" and "Sent" folders, ...
Leveraging "Draft" and "Sent" folders to initiate submission is much
simpler than asking SMTP servers to talk IMAP.
--
Viktor.
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