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Change attach_inline_image default domain from hostname to "inline".

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This avoids problems with ESPs that don't distinguish *Content-ID*
from attachment filename, where a local hostname ending in ".com" could
cause Gmail to block messages sent with inline attachments.
(Mailgun, Mailjet, Mandrill and SparkPost have APIs affected by this.)

Fixes #112.
This commit is contained in:
medmunds
2018-07-06 16:30:27 -07:00
parent 3f2c6d6917
commit e6431a62f0
4 changed files with 54 additions and 2 deletions
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11
CHANGELOG.rst
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@@ -33,6 +33,16 @@ Breaking changes
* **SendGrid:** Remove the legacy SendGrid *v2* EmailBackend
(Anymail has defaulted to SendGrid's newer v3 API since Anymail v0.8.)
Fixes
~~~~~
* Change `attach_inline_image()` default domain for *Content-ID* to "inline" (rather
than Python's `make_msgid()` default local hostname). This avoids problems with ESPs
that don't distinguish *Content-ID* from attachment filename, where a local hostname
ending in ".com" could cause Gmail to block messages sent with inline attachments.
(Mailgun, Mailjet, Mandrill and SparkPost have APIs affected by this.
See `#112`_ for more details.)
Other
~~~~~
@@ -745,6 +755,7 @@ Features
.. _#108: https://github.com/anymail/issues/108
.. _#110: https://github.com/anymail/issues/110
.. _#111: https://github.com/anymail/issues/111
.. _#112: https://github.com/anymail/issues/112
.. _@calvin: https://github.com/calvin
.. _@joshkersey: https://github.com/joshkersey