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From: Bjorn Halvor Solberg <bhso@pacbell.net>
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Subject: Re: GIF/jpeg attached as quoted-printable in MIME?
Date: 08 Sep 1999 17:14:27 -0700
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Bjorn Halvor Solberg writes:

> When sending JPEG or GIF files through C-c C-a, it appears they get
> encoded as quoted-printable instead of base64.  [...]

Many thanks to Shenghuo ZHU for pointing out the variable
mm-content-transfer-encoding-defaults and how mm-qp-or-base64 works, in
mm-encode.el.  I added ("image/.*" base64) to the list, and gif/jpeg is
now encoded using base64.

The problem was really that software on the recipient side didn't know
what to do with the QP-encoded image, Gnus itself handled that just fine
as a recipient.

Bjorn.