Connection Error
email error
Authentication Errors
Configuration Errors
Connection Error
connection-errors
Error 451-4.3.0: Mail Server Temporarily Rejected Message
Error: SMTP Error 543 – Routing Server Failure
Error: SMTP Error 542 – Bad Connection
Error 451-4.4.2: Timeout – Closing Connection
SMTP Error 449
Error: 442 Connection Dropped During Transmission
SMTP Error 446
cURL Error 60: SSL Certificate Problem
SMTP Error 547
SMTP Error 420: Timeout Connection Problem
SMTP Error: Port 456
SMTP Error 453
Error 523: Origin Is Unreachable
Error 550-5.7.1: Unauthorized Email Rejection
cURL error 56: OpenSSL SSL_read: SSL_ERROR_SYSCALL
cURL Error 6: Could Not Resolve Host
Error: SMTP connect() failed
Error 502: Bad Gateway
Error 421: Service Not Available, Closing Transmission Channel
cURL Error
cURL Error 28: Connection Timed Out
Error: Could Not Connect to SMTP Host
Error: Connection Refused
Error: Resource Not Found
email error
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
Authentication Errors
authentication-errors
Error 403: access_denied
Error 550-5.7.0: Mail Relay Denied
Error: invalid_grant
Error: Could Not Authenticate
Error: Key Not Found
Error: InvalidAuthenticationToken
Error: Token Has Been Expired or Revoked
ErrorSendAsDenied
401 Error: invalid_client
Error: invalid_client: AADSTS7000222
Error: Password Command Failed
Error 503: Bad Sequence of Commands
Error: 403 Forbidden
Error 535: Authentication Credentials Are Invalid
Error: SMTP Error 550
Error 550-5.7.26: This Mail Is Unauthenticated
Error: AADSTS700016: Application With Identifier Not Found in the Directory
Error: invalid_grant: AADSTS700082
SMTP Error 504: Timeout Error
Error 454 4.7.0: Too Many Login Attempts
Error 401: Unauthorized – No Valid API Key
SMTP Error 533
SMTP Error 530
Error: 550 5.7.708 Service Unavailable
Error: Could Not Open Socket
Error 504-5.7.4: Unrecognized Authentication Type
SMTP Error 471
Error 513: Relaying Denied
Error 535-5.5.4: Optional Argument Not Permitted for Auth Mode
Error 412: Account Pending Approval
Error 503-5.7.0: No Identity Changes Permitted
Configuration Errors
configuration-errors
Error 530-5.7.0: Must issue a STARTTLS command first
Error 454-5.5.1: STARTTLS May Not be Repeated
Error 554-5.7.0: Too Many Unauthenticated Commands
Error 512: Domain Can Not Be Found
Error 546: Email looping
Error 515: Destination Mailbox Address Invalid
Error 501-5.5.2: Cannot Decode Response
Error 400: Invalid_request
Error: SMTP Error 555
Error: SMTP Error 538
Error: SMTP Error 511
Error 405: Method Not Allowed
Error 504: Command Parameter Not Implemented
Error 502: Command Not Implemented
Error 501: Syntax Error in Parameters or Arguments
Error 553: Requested Action Not Taken
Error 500: Syntax Error, Command Unrecognized
Error 455: Server Unable To Accommodate the Parameters
Error: The From Address Does Not Match a Verified Sender Identity
Error: AADSTS50011: The Redirect URI Does Not Match
Error: Invalid_request: AADSTS50194
Error: Signature Does Not Match
Error: Redirect URI Mismatch
Error: API_key: Invalid
Error: Invalid Client Secret
Error: Channel Not Found
Error: MailboxNotEnabledForRESTAPI
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