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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.
Common Microsoft Outlook error codes
503 This mail server requires authentication / 503 Valid RCPT command must precede DATA
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