Add support for outgoing mail priority header.
…eriors Fixed crash when XLIST command return \NoInferiors flag.
Implement [CTCoreMessage isDeleted].
Put the hard-coded error domain name in a #define.
This allows callers to use the name without hard-coding it themselves.
This cleans up some almost-copy-and-paste code at the same time.
Support for get/set the extension flags for CTCoreMessage.
Fix to CTSMTPAsyncConnection so that it can also use SMTP with SSL on port 465.
… port 465. Copied the changes made in the commit to CTSMTPConnection 2ac9928 on 20th November 2012 to enable the same feature.