Hello,

when a SMTP client reaches maximum number of connections, I't like to send the
temporary error prior to closing connection. 

It should be something like
"421 Service not available, closing transmission channel"

would you find it useful to add parameter for couriertcpd to provide such
info, or probably additional parameters to -maxperip,-maxperc,-maxprocs
commands?

there are some MTA's that flood our servers with too many parallel
connections and I hope at least some would stop if rec eived error message
instead of just connection closed...

the -denymsg does not work at this level and I am not sure if it should

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