Plugin doesn’t work anymore

Hello,

First time I used Zoho Mail plugin it worked properly and it sent emails and I could receive them.
But after upgrading WordPress core to v5.9.1 it stopped sending emails although showing it is fine. I have also tried Email Log plugin to see if the problem is by WordPress or Zoho services, that it showed that emails was sending without porblems, but not being received by any other emails.
I also have a doubt that it may have happened because I have removed the mail folder in main directory of my webhosting.

Would you please help me fix it?

Regards,
hamid0740