Mail gateway does a double DNS lookup and adds local domain name

captainproton

Member
Aug 18, 2021
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1
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I am using 6.4-4 and after looking at my dns lookup logs I see an oddity I can't figure out.

For example, if my server is example.com and an external server (smtp.someserver.com) connects my server does a look up for smtp.someserver.com.example.com. Obviously this is returned as NXDOMAIN. Then my mail server does another lookup for smtp.someserver.com and gets the correct result.

Is that normal? Perhaps I'm missing something in the configuration.

EDIT: I should have mentioned I'm using Pihole for my internal DNS.
 
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