Truncated, retrying in TCP on Reverse lookup

[Erisan Nyamutenha]

Hi All
 
In order for my email server to accept mail from an external source, it does a reverse lookup on the source. I have email coming from a sender whose ip address maps to several hostnames i.e there PTR records pointing to the same IP. when I try to reverse lookup with my own DNS I get the following ;;Truncated, retrying in TCP mode then eventually I get a time out or server can't find 38.126.7.196.in-addr.arpa: SERVFAIL. What could this be?
 
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