The original message was received at Sat, 1 Dec 2007 00:35:03 -0500 from localhost.localdomain [127.0.0.1] ----- The following addresses had permanent fatal errors ----- (reason: 550-Verification failed for ) ----- Transcript of session follows ----- ... while talking to mail.1stmerchantfunding.com.: >>> DATA <<< 550-Verification failed for <<< 550-Previous (cached) callout verification failure <<< 550 Sender verify failed 550 5.1.1 ... User unknown <<< 503-All RCPT commands were rejected with this error: <<< 503-Sender verify failed <<< 503 Valid RCPT command must precede DATA