Viewing articles tagged 'SMTP'

 503 valid RCPT command must precede DATA SMTP Error

503 valid RCPT command must precede DATA Error occurs when the mail client attempts to send an...

 550 From domain must match authenticated domain

550 From domain must match authenticated domainA 550 From domain must match authenticated domain...

 550 Sender is not allowed

550 Sender is not allowedA 550 Sender is not allowed error occurs when a sender or domain name...