Searching emails - issue when orthography

[Marek Vach]

Hello,
i think problem is about formating search sentence to mail hosting. There is probably missing support of UTF-8. Could someone who understant problematic fill the gap and edit code to support UTF-8, please?

I get error:
Neznámá chyba. (TAG6 NO SORT: mtd: internal error: SEARCH Syntax error (Bad token)

when I try to search any word with czech orthography like "česko" = czech

[AfterLogic Support]

This might actually be caused by UTF8 support missing for search on mail server side. To look into this further, we'd need debug logs recorded when performing IMAP search.

[Marek Vach]

Debug log in attachment for search word "česko". Thank you for your helping.
log-2020-11-03.txt

[Marek Vach]

Email provider is seznam.cz. I'm using domain email.cz there, but domain shouldn't matter.
Setting for email client is here. For case of duplication my situation.

[AfterLogic Support]

Indeed, it looks like this particular mail server doesn't support UTF8 search, you may wish to contact their support in this regard.
On our own server, using WebMail Lite live demo, such a search is performed just fine.

[Marek Vach]

Seems they are using RFC 2822 or RFC 5322

Please, where can I find line of used formating and replace UTF-8 by one of these?
[07:01:45.66][52fe9649] IMAP[DATA]: > TAG6 UID SORT (REVERSE ARRIVAL) UTF-8 OR OR OR FROM "česko" TO "česko" CC "česko" SUBJECT "česko"\r\n

• this line saved in log

[AfterLogic Support]

getMessagesInfo function in modules/Mail/Managers/Main/Manager.php file would be a starting point.

By the way, you can try replacing the following line therre:

bUseSortIfSupported = $oImapClient->IsSupported('SORT'); 

with:

bUseSortIfSupported = false; 

There's a chance this will help, if mail server can't handle SORT but can do simple SEARCH.