Unable to send mail

Hello. On Android 15 I use version 10.0. I can’t send me a message. It writes an error: SMTPRESPONSEPARSEREXCEPATION: UNEXPECTED END OF STREAM.
On Android 10 I use version 5.600, leaving the post office fine. Both are set the same:
Server: smtp.seznam.cz
Security: SSL/TLS
Port: 465
Overe: Nomalous password
For version 5.600, the “request login” check is also. Here it also mentions the instructions of Seznam.cz for setting up outgoing mail. But in version 10.0 this option is not at all and therefore cannot be checked. Can you please advise me what to do?
Thank you

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Hard to say off hand, could you file an issue and provide some logs? The end of stream error can be server-side or a network issue, but if you say it works in 5.600 then maybe something changed.

SAME HERE. Last few weeks, mail is sending, but stays in outbox also. CONSTANTLY getting notification saying mail failed to send and showing it still in outbox, even though it did go through!
I’ve uninstalled and reinstalled and still happening. Android/samsung.

I am running Android 15 and have version 10.0. The phone is a Pixel 9 Pro XL, too.

I also had the problem that my messages were no longer being sent.

This helped me:
Account Settings - Send Emails - Outgoing Mail Server - and then click “Next.” After that, everything worked again.

I hope this helps someone else.