I am running a cron job which executes the python script for reading gmail (2 min interval). I have used imaplib for reading the new mails. This was working fine until yesterday. Suddenly its throwing below error imaplib.error: [AUTHENTICATIONFAILED] Invalid credentials (Failure) and sometimes i am getting the below error raise self.abort(bye[-1]) imaplib.abort: [UNAVAILABLE] Temporary System Error When i run the same script on a different machine. Its working fine. I am assuming that the host has been blacklisted or something like that. What are my options ? I cant generate the Credentials (Gmail API) as this is under company domain account. Continue reading...