postfix pop3 problem -- Connection refused

Okay, I've got something stumping me here on postfix setup on Ubuntu 8.04 LTS 64bit.

The gist of the problem: I can send email from my home system to it with SMTP, but I cannot retrieve messages via pop3.

When I telnet to port 110 from home, I get a connection refused. But when I telnet from the localhost to port 110, it goes through.

It's not a firewall issue. When the firewall is blocking that port, I can see the connection getting blocked in the log files, and disabling the firewall completely yields the same result.

My linode is setup as a subdomain of a domain hosted elsewhere. I don't think that could be related but …

My best estimate is that there's something Ive got screwed up in the main.cf or master.cf file.

Here's my main.cf:

smtpdbanner = $myhostname ESMTP $mailname (Ubuntu)

biff = no

appenddotmydomain = no

readme_directory = no

smtpdtlscert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem

smtpdtlskey_file=/etc/ssl/private/ssl-cert-snakeoil.key

smtpdusetls=yes

smtpdtlssessioncachedatabase = btree:${datadirectory}/smtpdscache

smtptlssessioncachedatabase = btree:${datadirectory}/smtpscache

myhostname = localhost

alias_maps = hash:/etc/aliases

alias_database = hash:/etc/aliases

myorigin = /etc/mailname

mydestination = subdomain.domain.com, localhost, localhost.localdomain, localhost

relayhost =

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128,aa.bb.cc.dd # Home IP

mailbox_command = procmail -a "$EXTENSION"

mailboxsizelimit = 0

recipient_delimiter = +

inet_interfaces = all

virtualaliasmaps = hash:/etc/postfix/virtual

virtualaliasdomains = $virtualaliasmaps

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master.cf is in it's virgin form. I'll post that if appropriate.

I've been on this more than a day with no progress.

Thanks in advance for any help anyone can offer.