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also consider Content-ID when marking attachment as inline (#126)

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Handle MIME attachments with Content-ID as inline by default.

Treat MIME attachments that have a *Content-ID* but no explicit *Content-Disposition*
header as inline, matching the behavior of many email clients.
This commit is contained in:
Leo Antunes
2018-10-11 23:29:00 +02:00
committed by Mike Edmunds
parent 4028eda583
commit 64f7d31d14
4 changed files with 62 additions and 1 deletions
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docs/sending/django_email.rst
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@@ -88,6 +88,15 @@ and :meth:`~email.message.Message.add_header` should be helpful.)
Even if you mark an attachment as inline, some email clients may decide to also
display it as an attachment. This is largely outside your control.
.. versionchanged:: 4.3
For convenience, Anymail will treat an attachment with a :mailheader:`Content-ID`
but no :mailheader:`Content-Disposition` as inline. (Many---though not all---email
clients make the same assumption. But to ensure consistent behavior with non-Anymail
email backends, you should always set *both* :mailheader:`Content-ID` and
:mailheader:`Content-Disposition: inline` headers for inline images. Or just use
Anymail's :ref:`inline image helpers <inline-images>`, which handle this for you.)
.. _message-headers: