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Sorry, we have no DNS information about unknown-3877.agava.net. agava.net is a domain controlled by two nameservers at agava.net.ru. They are on different IP networks. Incoming mail for agava.net is handled by two mailservers on different IP networks. agava.net has one IP number.

agava.net
a records
 
+ 89.108.65.143 89.108.64.0/22 AS39561  
+ ---  
ns-soa records
ns1.agava.net.ru
+ 89.108.104.3 89.108.104.0/22 AS43146 -
+ --- -
ns records
ns1.agava.net.ru
+ 89.108.104.3 89.108.104.0/22 AS43146 -
+ --- -
ns2.agava.net.ru
+ 89.108.64.2 89.108.64.0/22 AS39561 -
mx records
gate.agava.net
+ 89.108.96.7 89.108.96.0/22 AS43146 gate.agava.net.ru
+ --- gate.agava.net.ru
relay.agava.com
+ 89.108.65.139 89.108.64.0/22 AS39561 relay.agava.net.ru
+ --- relay.agava.net.ru
IP numbers using PTR to this host
89.108.73.159