Why does my mail to RKG bounce?

[Richard Guy]

This message received OK   R.

On Thu, 14 Sep 2006, David Wilson wrote:

> My mail to RKG seems to bounce. The address I have seems to match Seqfan mail from RKG, so I think the addy is up to date. Did I do something to offend his server?
>
> ---------------------------------------------------------------------------------
> Reporting-MTA: dns; comcast.net
> Arrival-Date: 14 Sep 2006 18:25:46 +0000
> Content-Type: text/plain
>
> Final-Recipient: rfc822; <rkg at cpsc.ucalgary.ca>
> Action: failed
> Status: 5.0.0 550_5.7.1_<rkg at cpsc.ucalgary.ca>..._Access_denied
> Diagnostic-Code: smtp; Permanent Failure: Other undefined Status
> Last-Attempt-Date: Thu, 14 Sep 2006 18:25:47 -0000
>