When MySQL runs in strict mode, you can't order by a column that isn't
part of the select.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

* Query IMAP only if necessary
* Fix pagination (when IMAP results are used)
* Fix CC and BCC search queries

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Co-authored-by: Roeland Jago Douma <roeland@famdouma.nl>
Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>
Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>