While approving a email notification for iexpence approval email notification getting mail back with content as
----- The following addresses had permanent fatal errors -----
<wf_ibisbtc@dm01e2db-zone03.east.xx.com>
(reason: 550 5.2.0 /var/mail/wf_ibisbtc: irregular file)
----- Transcript of session follows -----
... while talking to local:
<<< 550 5.2.0 /var/mail/wf_ibisbtc: irregular file
554 5.0.0 Service unavailable (/var/mail/wf_ibisbtc: irregular file)
Please suggest how to resove this.