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R5.0.3 adds multiple relay support utilizing Foreign SMTP Domain documents. In R5 these documents were ignored unless SMTP External was disabled. For customers wishing to maintain the current R5 behavior the following NOTES.INI variable should be used: RouterIgnoreForeignSMTPDomains=1.

Note: This change will affect only customers with an R5.x server with SMTP External enabled and Foreign SMTP Domain documents in the Domino Directory who got used to R5's behavior.