- 554 delivery error: dd Sorry your message user@domain cannot be delivered2013-11-27
- SMTP error, RCPT TO: 550 REJECTED - your hostname is bad2013-11-27
- DNS query error: abc.com'.(DNS query error:abc.com')2013-11-27
- SMTP error, RCPT TO: 550 abc@yourdomain.com:user locked2013-11-27
- SMTP error, RCPT TO: 550 Callout verification failed abc@yourdomain.com2013-11-27
- Requested action not taken: mailbox unavailable or Anti-spam Action2013-11-27
- User is suspended2013-11-27
- The account or domain may not exist, they may be blacklisted, or missing the proper dns entries2013-11-27
- 421 Syntax error2013-11-27
- SMTP error, MAIL FROM: 501 5.1.0 Emetteur invalide. Invalid Sender2013-11-27
- SMTP error, RCPT TO: 550 No such user - psmtp2013-11-27
- This Message was undeliverable due to the following reason2013-11-27
- Recipient address rejected: User unknown in virtual mailbox table2013-11-27
- SMTP error, DOT: 554 delivery error: dd This user doesn't have a yahoo.com account (abc@yahoo.com) [0]2013-11-27
- SMTP error, RCPT TO: 550 #5.1.0 Address rejected abc@yourdomain.com2013-11-27
- SMTP error, RCPT TO: 553 5.3.0 ... No such user2013-11-27
- SMTP error, RCPT TO: 550 Recipient Suspended2013-11-27
- SMTP error, RCPT TO: 550 5.1.1 User unknown2013-11-27