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From: Roger Burton West <roger@firedrake.org>

On Tue, Aug 18, 2009 at 08:07:07PM +0200, Santiago Vila wrote:

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I'm running SmartList on an amd64 system (which is 64-bit) without any problem at all.

Ditto.

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If you are still trying different MTAs, try postfix. In my experience, SmartList works out of the box with postfix.

I've had no problems with Exim, either...

And I've been happily using it with Sendmail on a 64bit UltraSPARD machine for years.