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Sorry, we have no information about mx5.agora.pl. agora.pl is delegated to two nameservers, however one delegated nameserver is missing in the zone and one other nameserver is listed instead. All of them are on different IP networks. Incoming mail for agora.pl is handled by three mailservers at agora.pl themselves. Two mailservers have the same IP number. They are on the same IP network. agora.pl has one IP number.

agora.pl
a records
 
+ 80.252.0.135 80.252.0.0/20 AS8535  
+ ---  
ns-soa records
hera.gazeta.pl
+ 193.42.228.9 193.42.228.0/22 AS8535 -
+ --- -
ns records
hera.gazeta.pl
+ 193.42.228.9 193.42.228.0/22 AS8535 -
+ --- -
zeus.gazeta.pl
+ 194.149.228.9 194.149.228.0/22 AS8535 -
artemida.krak.gazeta.pl
+ 193.193.65.3 193.193.64.0/21 AS8267 jozef.vii-lo.krakow.pl
+ --- jozef.vii-lo.krakow.pl
mx records
mx1.agora.pl
+ 193.42.228.11 193.42.228.0/22 AS8535 mx4.agora.pl
+ --- mx4.agora.pl
mx2.agora.pl
+   AS?  
+ ---  
mx3.agora.pl
+ 193.42.228.11 193.42.228.0/22 AS8535 mx4.agora.pl
+ --- mx4.agora.pl
nameservers missing in parent delegation
zeus.gazeta.pl
nameservers missing in zone
artemida.krak.gazeta.pl