[CentOS] exim rpm with DKIM support for CentOS?

I haven't learned a lot about DKIM yet, but I guess I'll need to implement it in the near future, at first for signing outgoing mail. I'm using exim as an MTA.

I guess the standard exim 4.63 binary rpm from CentOS repos propably does not have DKIM support yet? Or does it, maybe?

Provided the standard binary rpm does not provide this functionality, what would be the most decent way to get this functionality? Does the standard source rpm already include the necessary code, re-building the binary rpm with some additional option wouldn't sound bad. If not going this way, what could be a realiable source for a suitable exim rpm (either source or both the x86 and 86_64 binaries) for use in CentOS?

Regards, Timo