[Mailman-Users] Sending to Verizon users.

[User for Mailman mail list]

Banging my head against the wall ( and it hurts..)

On the different list from our Mailman mail list server, the mail goes out
fine except for users with a "verizon.net" address. Here is a typical
syslog entry:

Jun 26 12:57:29 secure sm-mta[13001]: k5QJv2Gt012804:
to=<auser at verizon.net>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=176103,
relay=relay.verizon.net. [206.46.232.11], dsn=5.0.0, stat=Service unavailable


But if I send that user an email from that same server (but not from
Mailman) the log shows:

Jun 26 14:23:05 secure sendmail[15184]: k5QLN5UB015181:
to=<auser at verizon.net>, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=120295,
relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (k5QLN5kD015185 Message accepted for delivery)

Jun 26 14:23:12 secure sm-mta[15195]: k5QLN5kD015185: to=<auser at verizon.net>, delay=00:00:07,
xdelay=00:00:07, mailer=esmtp, pri=120469, relay=relay.verizon.net.
[206.46.232.11], dsn=2.0.0, stat=Sent (2.5.0 Ok.)


I'm at a loss. All the other mail gets delivered properly but not the
verizon.net mail.

This is a Debian system with Mailman version 2.1.5-8 (Debian's stable version).

Any ideas?

Thanks,

Ken