I'm having some difficulties getting qmail to work. I can, with Eudora (or
Outlook), read mail, but not send. Eudora tells me this error: Network
Unreachable.

And, checking from the command line, I discovered this:

# telnet 64.91.109.167 25
Trying 64.91.109.167...
Connected to 64.91.109.167.
Escape character is '^]'.
Connection closed by foreign host.

I checked some logs, in particular /var/log/qmail/qmail-smtpd, there is this
(lots of them, this one is typical):

/etc/tcp.smtp.cdb: file does not exist
@400000003f78dd911e590cf4 tcpserver: end 4031 status 28416
@400000003f78dd911e591c94 tcpserver: status: 0/20
@400000003f7999142e4413fc tcpserver: status: 1/20
@400000003f7999142e45e0ec tcpserver: pid 4568 from 67.40.32.57
@400000003f799914313c2234 tcpserver: warning: dropping connection, unable to
read

So, upon doing some checking, I rebuilt the tcpserver cdb file with

# qmailctl cdb

And now.

# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 botteronet.net ESMTP
quit
221 botteronet.net
Connection closed by foreign host.

So that seems to be taken care of, but still Eudora (and other clients as
well) can not send.

Where should I look? What does any of this tell you?