Reverse Dns Question...is it really necessary or not?

[Len Conrad]

>if no reverse dns are setup for my domains, is it possible that I may
>miss couple of emails?

very definitely.

Using DNS records to verify incoming mail and sending IPs, at least to 
assign it some level of credibility, is a solid, proven assistance in 
reducing spam.

An outbound MTA having no PTR record (which means that the PTR hostname 
also has a "matching" A record) is one foot in hell, imo.  It will be 
considered as one strike against your attempted delivery by many MXs, where 
one or two more strikes (at the envelope, pre-DATA level will mean, 
increasingly, rejection.

Len


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