[exim] bounced messages

Emails I send to domains like gmail and hotmail, and quite a few others keep
bouncing with errors like this:

<gmail>
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

someone@???
etry timeout exceeded

----- This is a copy of the message, including all the headers. ------
message here
</gmail>


or this
<hotmail>
This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 24 hours on the queue on matilda.

The message identifier is: 1EbWAJ-0000gK-La
The subject of the message is: testing 1 2 3
The date of the message is: Mon, 14 Nov 2005 00:42:00 -0400

The address to which the message has not yet been delivered is:
</hotmail>
<msglog>
2005-11-15 00:36:54 Received from john@??? H=woody [192.168.0.2] =
P=esmtpa A=fixed_plain:shea S=534 id=3D200511150036.40818.john@???
2005-11-15 00:36:55 john@??? R=dnslookup T=remote_smtp defer
(-53): retry time not reached for any host
</msglog>

Thanks,

~S