Please comply with RFC 1912

Specifically, the following paragraph:

Make sure your PTR and A records match.  For every IP address, there should be a matching PTR record in the domain.  If a host is multi-homed, (more than one IP address) make sure that all IP addresses have a corresponding PTR record (not just the first one). Failure to have matching PTR and A records can cause loss of Internet services similar to not being registered in the DNS at all.  Also, PTR records must point back to a valid A record, not a alias defined by a CNAME.  It is highly recommended that you use some software which automates this checking, or generate your DNS data from a database which automatically creates consistent data.

This really is not hard to do and would be a good idea. Some mail servers do not like mail that comes from servers that do not comply with the above paragraph. Please Comply.
It is also not a very long RFC so please give RFC 1912 a read!

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