Since switching to TPG when I send bulk emails to members od my Association I am getting error codes as follows:- <<< 452 4.5.3 Recipients belong to multiple regions ATTR38 [SN1NAM01FT064.eop-nam01.prod.protection.outlook.com] <traindriver46@hotmail.com>... Deferred: 452 4.5.3 Recipients belong to multiple regions ATTR38 [SN1NAM01FT064.eop-nam01.prod.protection.outlook.com] This one appears to be happening for all hotmail addressees. <<< 451 4.7.1 Greylisting in action, please come back later <mclean5@skymesh.com.au>... Deferred: 451 4.7.1 Greylisting in action, please come back later <<< 554 5.5.1 Error: no valid recipients ... while talking to mx1.skymesh.com.au.: How can I resolve these problems? Regards, Carol Wilson ... View more