Error Library
- cURL Error
- cURL Error 28: Connection Timed Out
- Error: API_key: Invalid
- Error: Channel Not Found
- Error: Connection Refused
- Error: Could Not Authenticate
- Error: Could Not Connect to SMTP Host
- Error: Data Not Accepted
- Error: Email Sending Limit
- Error: Invalid Client Secret
- Error: invalid_grant
- Error: InvalidAuthenticationToken
- Error: Key Not Found
- Error: MailboxNotEnabledForRESTAPI
- Error: Resource Not Found
- Error: Traffic Not Accepted From This IP
- Error 403: access_denied
- Error: Redirect URI Mismatch
- Error: Token Has Been Expired or Revoked
- Error: Signature Does Not Match
- Error 450: Requested mail action not taken – mailbox unavailable
- ErrorSendAsDenied
- 401 Error: invalid_client
- Error 421: Service not available, closing transmission channel
- Error 502: Bad Gateway
- Error: Invalid_request: AADSTS50194
- Error: invalid_client: AADSTS7000222
- Error: AADSTS50011: The Redirect URI Does Not Match
- Error: SMTP connect() failed
- Error: The From Address Does Not Match a Verified Sender Identity
- Error: Password Command Failed
- cURL Error 6: Could Not Resolve Host
- Error 521: Server does not accept mail
- cURL error 56: OpenSSL SSL_read: SSL_ERROR_SYSCALL
- Error 503: Bad Sequence of Commands
- Error 541: The Recipient Address Rejected Your Message
- Error 451: Requested Action Aborted: Error in Processing
- Error 455: Server Unable To Accommodate the Parameters
- Error 500: Syntax Error, Command Unrecognized
- Error: 403 Forbidden
- Error 535: Authentication Credentials Are Invalid
- Error 552: Requested Mail Action Aborted
- Error: SMTP Error 550