Work around recent (unannounced) Sendinblue API change
that caused "Invalid headers" API error with non-string
custom header values, by converting basic numeric types
to strings. (Borrowed code from SendGrid backend.)
Fixes#288
Workaround for Django multipart/form-data limitation
where certain attachment filenames cause fields to be dropped
or to end up in request.POST rather than request.FILES.
Handle the MultiValueDictKeyError in inbound webhooks when
this has occurred. Also update docs to recommend avoiding
the problem by using Mailgun and SendGrid's "raw MIME" options.
Also handle reported cases of empty, duplicate keys in Mailgun's
content-id-map.
Fixes#272
pypy-3.8-v7.3.8 accidentally shipped with sqlite v3.7.17,
which is a decade old, and causes the tests to fail with
`django.core.exceptions.ImproperlyConfigured:
SQLite 3.9.0 or later is required`.
Until pypy-3.8-v7.3.9 is available in actions/setup-python,
work around the problem by forcing unqualified "pypy-3.8"
to specific (older) version "pypy-3.8-v7.3.7".
See https://foss.heptapod.net/pypy/pypy/-/issues/3690
and https://github.com/actions/setup-python/issues/339.
Remove `AnymailError.describe_send`, which added sender and
recipient email addresses to every AnymailError message
(whether or not relevant to the error).
Addresses #245
Improve handling of alternative parts and `content_subtype`
to match how Django's SMTP backend handles some unusual cases.
Change Test backend to support (and record) text/* alternative
parts. (But still reject other types of alternatives.)
Fixes#252
* Split test, integration-test, and release workflows,
simplifying config and logic for each.
* Use environment to separate secrets for release workflow.
* Update test matrix with newer Django and Python versions.
Postmark uses their ErrorCode 300 to report several different
send-time validation errors, some of which identify invalid
recipients that need to be handled specially, but many of which
are ordinary API errors.
Rework the logic for parsing ErrorCode 300 error messages:
Handle only "Invalid 'To'" or "Error parsing 'To'" (or 'Cc'
or 'Bcc') as recipient errors. Otherwise raise an API error.
Fixes#238 silent failure when sending with long metadata keys.
Allow inbound and tracking webhooks using SNS topics from any AWS region.
The topic subscription must be confirmed in the topic's own region (not
the boto3 default), determined by examing the topic's ARN.
Fixes#235
