vim comes with syntax highlighting for Postfix, but the syntax file is outdated and doesn't cover LDAP and other drivers.
For those who like an up to date syntax highlighting that reflects your Postfix installation take a look at https://github.com/sys4/vim-postfix. Christian (Rößner) took the time to create two scripts that will create syntax files. The README tells how to install them. Worked out of the box for me. p@rick -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG,80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein