Email Delivery Errors
- Error Due to Unsolicited and/or Bulk E-mail
- Error 421-4.7.0: TLS required for RCPT domain
- Error 540: Email Address Has No DNS Server
- Error 422: Storage Limit Exceeded
- Error 522: Recipient Has Exceeded Mailbox Limit
- Error 531: Mail System Full
- Error 452-4.5.3: Your Message Has Too Many Recipients
- Error 452-4.5.3: Domain policy size per transaction exceeded
- Error 450, ‘4.2.1’: Peak SMTP Relay Limit Exceeded for Customer
- SMTP Error 458
- SMTP Error 447
- Error 431: Insufficient Storage
- SMTP Error 432
- Error: MessageRejected (client): Email Address Is Not Verified
- SMTP Error 441
- Error 421-4.7.0 Unsolicited Mail and Rate Limiting
- SMTP Error 556: Message Too Large
- SMTP Error 517
- Error 554: Transaction Failed
- Error 551: User Not Local
- Error 452: Insufficient System Storage
- Error 552: Requested Mail Action Aborted
- Error 451: Requested Action Aborted: Error in Processing
- Error 541: The Recipient Address Rejected Your Message
- Error 521: Server Does Not Accept Mail
- Error 450: Requested Mail Action Not Taken – Mailbox Unavailable
- Error: Email Sending Limit
- Error: Data Not Accepted
- Error: Traffic Not Accepted From This IP