Install two MTAs on Gentoo

mojo asked:

Im migrating my Qmail/Vpopmail Install to MySQL/Postfix and want to test Postfix on different Ports than the current qmail Installation and bit by bit merge the config and Database – is there any way to Install both MTAs on the same Gentoo System or do i really have to take the long way using Virtualization/Chroot and the like?

When trying to emerge the Packages of course block each other.

My answer:

Postfix doesn’t care; it can be run on any ports you want just by editing its file. Gentoo’s blocking the package is entirely artificial and unnecessary. (And why on earth are you using Gentoo for this?!?!?)

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