Hello, I am getting following error in info log of dovecot. imap(someshb): Info: Connection closed (No commands sent) in=0 out=374 This error is for some users (not all) while sending email? via Thunderbird. The email is sent but not saved int the Sent folder. I tried to debug the issue and getting nothing except following Debug: Effective uid=2121, gid=4619, home=/users02/home/ppd_doaa imap(ppd_doaa): Debug: Namespace inbox: type=private, prefix=INBOX., sep=., inbox=yes, hidden=no, list=yes, subscriptions=yes location=maildir:~/Maildir:INDEX=/xx/index:CONTROL=/xx/index imap(ppd_doaa): Debug: maildir++: root=/xx/Maildir, index=/xx/index, indexpvt=, control=/xx/index, inbox=/xx/Maildir, alt imap(ppd_doaa): Debug: Namespace : type=private, prefix=, sep=, inbox=no, hidden=yes, list=no, subscriptions=no location=fail::LAYOUT=none imap(ppd_doaa): Debug: none: root=, index=, indexpvt=, control=, inbox=, alt namespace has following namespace inbox { ? hidden = no ? inbox = yes ? location ? mailbox Drafts { ??? special_use = \Drafts ? } ? mailbox Junk { ??? special_use = \Junk ? } ? mailbox Sent { ??? special_use = \Sent ? } ? mailbox "Sent Messages" { ??? special_use = \Sent ? } ? mailbox Trash { ??? special_use = \Trash ? } ? prefix = INBOX. ? separator = . ? type = private } i am using dovecot-2.2.36-10.el8.x86_64 Thanks for any help. -- Sincerely, Soumitri