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550 5.7.1 Recipient Prohibited (x)

(where 'x' is a number)

This means that you have an SMTP rule which is rejecting this recipient. The (x) indicates the SMTP rule number which is causing the rejection.

View & edit your SMTP rules at Services → SMTP Server → Filtering → Edit SMTP Rules.

how_to/550_5.7.1_recipient_prohibited_x.txt · Last modified: 2018/11/14 10:45 (external edit)