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thunderbird / thunderbird-android

Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)
https://thunderbird.net/mobile
Apache License 2.0
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Support Lemonade extensions for attachment forwarding without download on IMAP #1361

Open Hooloovoo opened 8 years ago

Hooloovoo commented 8 years ago

Expected behaviour

If an email message in a K9 IMAP account contains attachments, a user should be able to forward the email and its attachments without downloading the attachments. See also https://code.google.com/archive/p/k9mail/issues/216

Actual behaviour

The user has two options: forward the email without attachments; or download the attachments before forwarding the email.

Specifically, this requires the implementation of three Lemonade extensions: CATENATE, URLAUTH and BURL.

I believe that Isode's and Oracle's email servers already support the server side of these. Dovecot supports two and is scheduled to support the final one in its next release (2.3; https://www.ietf.org/mail-archive/web/apps-discuss/current/msg13450.html ), which should make this far more ubiquitous.

Trojita (and therefore Ubuntu Touch's email client) supports this feature: https://github.com/benkaiser/trojita/blob/master/docs/masters/mobile-imap.tex

Other useful background on this can be found in the Mail in a Box issue about this: https://github.com/mail-in-a-box/mailinabox/issues/801

stephanbosch commented 6 years ago

Dovecot has released v2.3 with the new submission server that includes BURL support. In the v2.3.0 technology preview it was still quite buggy, but v2.3.1 will be released in a few weeks, which should address all of these issues.

For development, you can of course already install Dovecot git master.

evert-mouw commented 6 years ago

This would be a very nice feature to have, not only to limit network traffic, but it might also speed up the sending of messages with attachments.

mbethke commented 4 years ago

Indeed, this would speed up sending any message about two-fold as it doesn't have to be uploaded both via SMTP and IMAP. Considering Dovecot's market share, this would probably benefit a majority of users right away.