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Incoming mail for gt.hamburgsud.com is handled by one mailserver at hamburgsud.com. hamburgsud.com is a domain controlled by two nameservers also at hamburgsud.com. They are on different IP networks. Incoming mail for hamburgsud.com is handled by two mailservers also at hamburgsud.com. They are on different IP networks.

gt.hamburgsud.com
mx records
smtpgt.hamburgsud.com
+   AS?  
+ ---  

hamburgsud.com
ns-soa records
ns4.hamburgsud.com
+ 62.44.32.166 62.44.32.0/23 AS41707  
+ ---  
ns records
ns4.hamburgsud.com
+ 62.44.32.166 62.44.32.0/23 AS41707  
+ ---  
ns5.hamburgsud.com
+ 212.72.167.3 212.72.160.0/19 AS8893 -
+ --- -
mx records
smtpham01.hamburgsud.com
+ 217.6.170.199 217.0.0.0/13 AS3320  
+ ---  
smtpham02.hamburgsud.com
+ 62.44.32.173 62.44.32.0/23 AS41707  
mailservers used by this domain
smtpgt.hamburgsud.com