Fwd: Returned mail: see transcript for details

Hello all,

I was able to sign up for pgadmin-hackers by sending e-mail to
pgadmin-hackers-request with the text "subscribe" in the subject line.
However, when my son attempts to do it, he keeps getting the message
below. Thoughts on what he may be doing wrong or if there is an issue
with the majordomo server?

Thanks,
Tom

---------- Forwarded message ----------
From: Benjamin Kincaid <bkin18(at)bu(dot)edu>
Date: Fri, Aug 19, 2016 at 6:29 PM
Subject: Fwd: Returned mail: see transcript for details
To: Tom Kincaid <tomjohnkincaid(at)gmail(dot)com>

---------- Forwarded message ----------
From: Mail Delivery Subsystem <MAILER-DAEMON(at)bu(dot)edu>
Date: Sat, Aug 13, 2016 at 10:41 PM
Subject: Returned mail: see transcript for details
To: bkin18(at)bu(dot)edu

The original message was received at Wed, 10 Aug 2016 22:38:03 -0400
from mail-wm0-f72.google.com [74.125.82.72]

----- The following addresses had permanent fatal errors -----
<pgadmin-hackers-request(at)postresql(dot)org>

----- Transcript of session follows -----
<pgadmin-hackers-request(at)postresql(dot)org>... Deferred: Connection timed
out with postresql.org.
Message could not be delivered for 3 days
Message will be deleted from queue

Final-Recipient: RFC822; pgadmin-hackers-request(at)postresql(dot)org
Action: failed
Status: 4.4.7
Remote-MTA: DNS; postresql.org
Last-Attempt-Date: Sat, 13 Aug 2016 22:41:25 -0400

---------- Forwarded message ----------
From: Benjamin Kincaid <bkin18(at)bu(dot)edu>
To: pgadmin-hackers-request(at)postresql(dot)org
Cc:
Date: Wed, 10 Aug 2016 22:38:02 -0400
Subject: subscribe

--
Thomas John Kincaid