Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 5.7.1 <email@example.com>: Relay access denied (state 14).
----- Original message -----
Received: by 10.100.43.11 with SMTP id q11mr409583anq.110.1299037015086; Tue,
01 Mar 2011 19:36:55 -0800 (PST)
Received: by 10.101.161.19 with HTTP; Tue, 1 Mar 2011 19:36:55 -0800 (PST)
Getting the relay denied error message means that you are attempting to send an email from a domain that is not in the allow relay list to a domain that is not hosted by the the ironmail. Simply put, you are attempting to send an email from external domain to another external domain using your ironmail.
The first thing you want to do is search for your email address in the ironmail logs, this should be able to give you more information.
From the CLI:
show events <date yyyymmdd> | grep <email address>