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Q & A > Error Codes > SMTP

  • 250 OK Response
  • 552 Requested mail action aborted: exceeded storage allocation
  • 550 Mailbox not found
  • 454 4.7.0 Temporary authentication failure
  • 530 5.7.0 Authentication required
  • 535 Authentication credentials invalid
  • 452 Too many recipients
  • 452 Requested action not taken: insufficient system storage
  • 451 Requested action aborted: local error in processing
  • 450 Requested mail action not taken: mailbox unavailable
  • 421 Service not available, closing transmission channel
  • 251 User not local; will forward
  • 554 5.3.4 Message too big for system
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