Вот такой отлуп пришел. Подскажите, что не так в рассылаемых письмах с webscript.ru
>>> DATA
<<< 550-Callback setup failed while verifying
<<< 550-Called: 81.19.74.77
<<< 550-Sent: MAIL FROM:<>
<<< 550-Response: 550 5.7.1 <>... Command rejected
<<< 550-The initial connection, or a HELO or MAIL FROM:<> command was
<<< 550-rejected. Refusing MAIL FROM:<> does not help fight spam, disregards
<<< 550-RFC requirements, and stops you from receiving standard bounce
<<< 550-messages. This host does not accept mail from domains whose servers
<<< 550-refuse bounces.
<<< 550 Sender verify failed
550 5.1.1 ... User unknown
<<< 503 valid RCPT command must precede DATA