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Hi 

 

a) do you keep one dedicated IP address per affinity? - Not necessarily, it depends on how many you have requested/is included in your contract. You may have multiple IPs associated to same affinity as well. 

 

NOTE : For more details now how IP Affinities are set read here . 

b) does it make a difference? Will it change the issue with a dual email sent? - No, Dual email sent as explained in the other post here, it could be related to delivery settings or exclusions not happening on delivery level. You must check the delivery settings to get this issue rectified. 

c) also, are the SQL deadlocks a possible reason for dual emails sent in case MTA uses more than one IP address and affinities for redundancy? SQL Dead locks has no relation with IP/Affinities. 

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