How would I correct this regex to allow for the presence or lack of a space?

Hello,
I have a bit of regex below, whcih is used to validate input from an email transaction. While I thought it was rfc compliant, some mail servers do not include the space in the command that I require. So I need to know how to alter this regex so that it returns true, regardless of whether the space is there or not.

Here is the code:

public boolean isValidMailFrom(String mailFrom)
    {
        final String RE_EMAIL = "(?i)Mail From: <[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}>";
        return mailFrom.matches(RE_EMAIL);
    }

The space in question is between the : and the <.

A working fix is worth 500 points.

Thanks,
Rick