kmail fails to send all addressees

I just discovered a curious issue with kmail.

I have 26 valid email addresses at one of my domain names
(@actionline.com) after setting up several hundred filters to
block garbage to my "catchall" email address, I wanted to
test the known valid names to make sure that none of my
filters were wrongly blocking any of the valid addressees.

When I sent a test email to all 26 valid addressees, the
first time, only 16 went through, and there was nothing
in the long header to identify which ones were missing.
So, I sent them all in groups of 4 to try to figure out which
ones were being blocked. They all went through fine.

So, I tried to send all 26 again, and the second time,
24 of the 26 went through. So I tried in two groups of 13
and all 13 of the first group went through but only 11 of
the second group.

What would cause kmail (or somewhere along the line) to
inconsistently drop a few of the email addresses?

Any ideas?

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