Question : MX record valid for bind?

I'm new to BIND and hosts files. Basically, I'm wondering if the following MX value in the testerdns2.info.hosts file is valid? It appears to be working fine when I perform a dig on it:

dig testerdns2.info MX

Please note the notation I used for the MX server though:

@      IN      MX      5 @

Is this in reality, the exact same as @ IN MX 5 testerdns.info.  ?

Code Snippet:

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$ttl 60 testerdns2.info. IN SOA ns1.smg-dns.com. chris.sunshinemediagroup.com. ( 1246484857 60 1801 604800 60 ) testerdns2.info. IN NS ns1.smg-dns.com. @ IN NS ns2.smg-dns.com. @ IN MX 5 @ subdomain.testerdns2.info. IN A 127.0.0.1 subdomain2.testerdns2.info. IN A 127.0.0.2 subdomain3.testerdns2.info. IN A 127.0.0.3 subdomain4.testerdns2.info. IN A 127.0.0.4

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Answer : MX record valid for bind?

It should function, it is possible that some mailers might be too picky.

Does mail work from gmail? if so, i wouldn't worry too much.

Kevin