4.1.8 Email Bounce Error Reason Sending Address Is Bad Or Can’t Accept Replies: Delayed Message The sending email system either…

4.1.7 Email Bounce Error Reason Sender’s Address Is Written Incorrectly: Delayed Message The email message has not yet been delivered…

4.1.6 Email Bounce Error Reason Email Address No Longer Accepts Or Forwards Messages: Delayed Message The recipient’s email address no…

4.1.5 Email Bounce Error Reason Valid Email Address: Delayed Message The email message has not yet been delivered even though…

4.1.4 Email Bounce Error Reason Multiple Mailboxes For Recipient: Delayed Message The recipient’s email address belongs to more than one…

4.1.3 Email Bounce Error Reason Email Address Malformed: Delayed Message The recipient’s email address is not a valid email address…

4.1.2 Email Bounce Error Reason Domain Name Of Email Address Not Valid: Delayed Message Because the recipient’s email provider says…

4.1.1 Email Bounce Error Reason User Name In Email Address Not Valid: Delayed Message Mailbox of the recipient’s email address…

4.1.0 Email Bounce Error Reason Unknown Issue With Recipient’s Email Address: Delayed Message The email message has not yet been…

4.0.0 Email Bounce Error Reason Unknown issue: Delayed Message Because of an unknown issue the email message could not be…