My ISP blocks port 25 so i am using a relay service to port 52525. It works when i implement a home router with no firewall perfectly but when i implement my Cisco router it doesnt go through even tho i created rules to allow it. i am confused. does cisco inspection look at the header and the way the packet is assembled and discard non port 25 packets because the signature isnt "correct"
also i am kind of hoping to NOT make my mail server an open relay! lol and only accept mail from the SendLabs servers. they have a list of IP's to allow but everything works on my send connector when it specifies allowed networks 0.0.0.0-255.255.255.255 but not when i delete that and add their IP range.