ActiveSync: Upload draft message

[benbucksch]

Implement function ActiveSyncFolder.addMessage(message: EMail).
You can assume that message.mime is populated.

Use cases:

• Move or copy a message between accounts (or protocols)
• Save Draft

[NeilRashbrook]

This isn't possible in ActiveSync.

[NeilRashbrook]

(Ugh, GitHub's issue closing UI sucks...)

[benbucksch]

@NeilRashbrook Is there a way to save Drafts?

[benbucksch]

https://msopenspecs.azureedge.net/files/MS-ASCMD/%5bMS-ASCMD%5d.pdf
Section 2.2.3.7.2 Add (Sync), page 75
"Add ... cannot be used to add any non-draft email items from the client to the server, or to modify the contents of the recipient information cache. Draft email items are not supported in protocol versions ... 14.1 [and below]. If a client attempts to add a non-draft email to the server, a Status element with a value of 6 is returned as a child of the Add element."

So, drafts should be possible. We need this function at least for drafts.

[NeilRashbrook]

Problems:

• Outlook.com accounts don't support 16.0.
• Draft email items don't support MIME.

[benbucksch]

Outlook.com accounts don't support 16.0.

Luckily, we're using IMAP as default protocol for outlook.com . (Second choice is OWA, and only the last choice is ActiveSync.)

For those who specifically chose ActiveSync: Too bad for these users. They won't have drafts.

What about Office365? Does it support 16.0 or 16.1?

Draft email items don't support MIME.

Can you upload the msg in ActiveSync format, based on the values form the EMail object? Including attachments?

(Given that ActiveSync is problematic, please implement in the order: EWS, OWA, ActiveSync.)

[NeilRashbrook]

I believe Office 365 does support 16.x.

Messages can be uploaded with attachments. Inline images will need an appropriate content ID (and src="cid:...").