GUI Error - Email SMTP

ERROR

420

Timeout communication problem encountered during transmission. This is a Novell GroupWise SMTP error

• If you experience 420 errors only with specific recipient then it is quite likely that the recipient’s anti-spam firewall does not like your server.
• If you experience too many 420 errors with all email communications, then you have a physical communication problem somewhere.

421

<Server name> Service not available – the sending email program should try again later

• “Mail Server” in this case can be any of the mail servers on the message’s route – the sending server (your server), the ISP SMTP server, or the recipient’s mail server.
• The Mail transfer service is unavailable because of a transient event. SMTP reply 421 can be caused by many things but generally indicates that the mail server which returns this status code is currently unavailable but may be available later.
• Clearly, if you repeatedly receive an SMTP status 421 then the problem is no longer of a transient nature and you need to investigate or inform the relevant network administrator, ISP tech support, or the recipient.

500

Syntax error, command unrecognised

501

Syntax error in parameters or arguments

502

Command not implemented

503

Bad sequence of commands

504

Command parameter not implemented

521

<domain> does not accept mail

530

Access denied

535

Email Username and Password not accepted

550

Requested action not taken: mailbox unavailable

551

User not local; please try <forward-path>

552

Requested mail action aborted: exceeded storage allocation

553

Requested action not taken: mailbox name not allowed

554

Message refused / Transaction failed

554 – message refused.

• The mail server was rejecting the address because it was bad. A transcription error allowed an relatively unnoticeable character into the address.

• Secureserver.net - Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.

554 – Transaction failed.

• Nowadays SMTP status 554 is in most cases returned when the recipient server believes your email is spam or your IP address or ISP server has been blacklisted on one or more.

• With Yahoo, on the other hand, this usually means the email address does not exist or has been disabled.

• With IBM’s Lotus Domino this is either a Domino bug or a Disk Full error.