Question about BIND Source Code

[Questions Answers]

Hello BIND users

I am using BIND 8.2.2 P7 on RH 6.2

I had a question about the lookup logic of BIND for MX
records. 

When an MX record of a domain is queried from an
Authoritative DNS for the domain, BIND recives a query
of type T_MX. It retrieves the MX record
e.g  mail.domain.com

And then it is supposed to look for the A record for
mail.domain.com , and put it in the ADDITIONAL SECTION

Could someone, please give me a pointer to the place
where it is done in the source code? I have traced
uptil the point where AUTHORITY SECTION is filled in 
(src/bin/named/ns_req.c Line 1142). 


Thanks much!



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