SMTP 4.4.1 Error when sending an email, What does it mean?
SMTP 4.4.1 Error message indicated the recipients host is not responding. This could be due to a temporary issue with thier network or mail server. We recommend resending the email as it's possibleÂ the issueÂ is transient. If the email continues to bounce back you should then consider contacting the recipient toÂ updateÂ their contact information.