I have a python script that uses a twisted imap4.IMAP4Client to check for new emails in a gmail account. It does so every ~30 seconds. It has been running fine for months.
Starting June 11, I began to see this message after the search("(UNSEEN)")
call:
Unhandled unsolicited response: ['OK', ['HIGHESTMODSEQ', '1234567']]
This message appears at every check for new messages now.
What does this message mean? Is it anything to worry about?