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+ | ======550 5.7.1 Recipient Prohibited (x)====== | ||
+ | (where ' | ||
+ | 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. |