Andrey Repin wrote:
Apr 7 12:00:21 mxs dovecot: imap(vera): Error: rename(/home/vera/.mail/INBOX/Майя Николаевна/new/1678353168.M710968P25673.mxs.ads.ccenter.lan,S=5442,W=5513:2,ST, /home/vera/.mail/INBOX/Майя Николаевна/cur/1678353168.M710968P25673.mxs.ads.ccenter.lan,S=5442,W=5513:2,ST) failed: Too many links
Looks like dovecot is trying to move the file from 'new' to 'cur' and failing.
'new' is where it puts new messages until something reads them and then they get moved to 'cur'.
What filesystem / OS is it?
It seems to point to some problem with the underlying filesystem reaching some maximum number of subdirectories or hard links, e.g.:
https://www.nexcess.net/blog/mkdir-too-many-links-what-it-is-and-how-to-fix/
It is interesting that you use maildir but with LAYOUT=fs
Also look at:
https://doc.dovecot.org/admin_manual/namespaces/ - as there are some limits mentioned.
https://doc.dovecot.org/configuration_manual/mail_location/Maildir
R.