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501 Too many syntax or protocol errors - Outlook / Outlook Express
Outlook Error: 0x800CC79
550-DKIM: encountered the following problem validating domain.com: 550 pubkey_unavailable
DKIM verification of the sender email server failed and the message was flagged as SPAM
Email error messages explained.
503 This mail server requires authentication / 503 Valid RCPT command must precede DATA
Common Microsoft Outlook error codes
Duplicated emails in Outlook
Outlook Error - 0X8004210A, 0X800CCC19
503 START TLS command used when not advertised Port: 25 Secure(SSL)
Outlook error (0x80042109) while sending messages