Very slow qmail response

[Tom Jackson]

My qmail has been running fine for a year or more. Now it is very slow
to accept connections on SMTP or POP3 ports. 

I get this behavior from other computers on the local network, but
everything works as usual from the qmail server.

I've tried it with telnet, Netscape and other software with the same
results.

What can/should I check?

Thanks,

--Tom Jackson