Troubleshooting Error 503 in Outlook: Valid RCPT Command Must Precede DATA
Encountering the Outlook Error 503, which states, “Valid RCPT command must precede DATA,” may occur during email transmission. This indicates a failure in authenticating your SMTP (outgoing mail) connection by your email server. The two primary reasons for this issue are: To resolve the Outlook Error 503 Valid RCPT command must precede DATA, follow these …
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