Transcript of session follows. 

 Out: 220 xls01.x1x.com ESMTP Postfix 
 In:  HELO 119.165.16.208 
 Out: 250 xls01.x1x.com 
 In:  MAIL FROM: <ckizqutxitaxzt@chol.com> 
 Out: 250 2.1.0 Ok 
 In:  RCPT TO: <info@pinkeyes.com> 
 Out: 250 2.1.5 Ok 
 In:  DATA 
 Out: 354 End data with <CR><LF>.<CR><LF> 
 Out: 451 4.3.0 Error: queue file write error 
 Out: 421 4.4.2 xls01.x1x.com Error: timeout exceeded 

Session aborted, reason: timeout

http://kb.parallels.com/en/6074