[courier-users] Can DNS Lookup failure stop outgoing message?

Hello all,

Is it possible that some kind of DNS error can stop an SMTP transaction
from an authorized user?

Occasionally, I am unable to send out an email via our mail server.
Unfortunately, I didn't have the message mutt gives me and it is a very
intermittant problem so I cannot reliably replicate it. My admittedly
vague recollection is mutt reported that the server complained about DNS
....

The problem seemed to go away when I turned off dnslookups, hence my
subject line.

The only other cause I can think of is that all the esmtpd connection
slots are used up. I didn't see any such messages in the log around the
time this happened last night--does Courier log a message when this
happens; for example, MAXPERC exceeded?

m



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