Software :: Any Way To Update Vim Syntax Highlighter Manually?

Is there a method or way to "update" Vim's syntax highlighter manually? I appear to have a very updated version of Vim on both Debian & Arch Linux but I notice that on both servers on the identical configuration file for Postfix MTA (main.cf) I have a parameter that shows up in 'white' which usually means 1 or 2 things:

1. I have a typo somewhere in my parameter.
2. The parameter is not recognized by Postfix and useless

However in this case it is neither of the two above however it stands out in the configuration file because it's not in color. It's the only one that is white text. I verified the command / parameter is valid: Link

The parameter is:
Code:
smtpd_tls_security_level = may

Is there a way to update Vim to highlight the " smtpd_tls_security_level" parameter in the configuration file when opened with Vim? Do I need to update the syntax highlighter for this to have the desired effect? I know this issue is purely cosmetic but as an administrator I find it annoyong to have to waste time and research if a configuration parameter is valid or not. I rely on Vim's color syntax highlighting to tell me when I make a overlooked mistake. I do know that Postfix is happy with the current configuration as I can see it being executed in the program:

Code:
postconf -n | grep "smtpd_tls_security_level"
smtpd_tls_security_level = may