Getting javax.mail.AuthenticationFailedException

Recently we have changed the SMTP Host for dev environment. We have modified the Email Account instance with the new SMTP Host name and checked the connectivity (Test connectivity). Everything is fine till now. But while trying to trigger this email account from correpspondence we are getting the error
"ERROR EMAIL.ZIP_DEV_CM_EmailListener.ZNA_DEV_CM_EMailServer EmailRequestorEI - Unexpected javax.mail.AuthenticationFailedException: The system was unable to log USZ_CM_RequestZ_Dev_POP3 in. Maildrop opened for exclusive access by another user."
Could you please suggest any thoughts.

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