rackow> There are multiple reasons not to use the expn command.
I agree. My experience has been that most non-sendmail SMTP
implementations do not support EXPN. (No great shakes since EXPN is
an optional SMTP command anyhow, but a lot of SMTP implementations
also skip some required commands as well.)
Perhaps the most important reason to not create a dependency on EXPN
is that there are still plenty of systems in the world that not only
don't run sendmail but also don't use SMTP at all.
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