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503 Valid RCPT command must precede DATA


503 Valid RCPT command must precede DATA – How to resolve this Outlook error in cPanel/WHM hosted email accounts

503 Valid RCPT command must precede DATA – How to resolve this Outlook error in cPanel/WHM hosted email accounts

Customers who use Outlook to access email accounts hosted on cPanel/WHM email servers sometimes report the error 503 Valid RCPT command must precede DATA when trying to send their mails.

This is often reported for servers in which SMTP authentication is enabled. (more…)