* Fixes a few bugs with missed message address for PMs and huddles.
* Uses missed message address for all missed message reply-to headers on
the zulip.com realm.
(imported from commit 61dd09386e1bbdf9a5096e2400984d31e73a5b74)
The one time use address are a unique token which maps to stored stated
in redis. We store the user_id, recipient_id, and subject. When an email
is received at this address it is sent to the stored recipient by the
stored user. Anyone with this address can send a single message as this
user.
(imported from commit 4219417bdc30c033a6cf7a0c7c0939f7d0308144)
Previously, the email mirror queue worker used the API bindings to send
messages to Zulip, as if it were any other API client.
This is inefficient since we're running the worker inside the Django
context on a machine with database access; we can instead just use the
internal message-sending functions we use elsewhere. This also resolves
potential issues with SSL certificates, etc. that might occur when we
were previously making a HTTPS connection.
(imported from commit 6de8015829bec440f1af0199a2138828e86ed2a4)
Here, we don't want to check the uploading users' realm when determining
message privacy, because that'll prevent non-Zulip users from having
email-mirror-uploaded images. Instead, we just pass along the target
realm for the message explicitly to upload_message_image()
(imported from commit 6891261552135b1f41ff9da55ffe963ee5000556)