Re: Fastest way to inject a lot of mail?

According to Claus A?mann  <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org>:

I'll have to check but I believe there's a local cache on the LAN.  It's
sending it all to a smarthost so I wouldn't expect a lot of DNS traffic.

>
Seems like a wrong expectation - or did you turn off DNS lookups?
It's explained in the fine documentation mentioned earlier:
* DNS Lookups

Ah, it's hiding in the TUNING file. I suppose I can turn off the
canonify stuff. The DNS caches are on the same LAN with ping times
under a millisecond so cache location is not likely to be a problem,
but the addreesses in the list should all be real ones.
Does sendmail really replace CNAMEs in recipient host names? That's
been deprecated for 25 years.
I must say it's pretty impressive that sendmail's internal structure is so
opaque that nobody has any idea whether running the sendmail program is
likely to be faster or slower than TCP submission.
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