Error Code Explanation Pages

These pages describe in more detail error codes returned by the mail system.

Here's a summary

• 01 You aren't allowed to send email to this address.
• 02 You aren't allowed to send attachments.
• 03 You aren't allowed to send html email.
• 04 The email looks too much like spam.
• 05 The email has a known virus signature.
• 06 Only authorized senders allowed.
• 10 HELO is unacceptable
• 11 return address doesn't validate.
• 5.5.2 Invalid address.