But, mr A-EON Support person - isn't it a web form?
http://www.a-eon.com/?page=contact
How would that not "go through"?
Sometimes, server does not like certain email addresses.
Don't make a big thing of this, cause it happens, not often but does.
I get same issues with my own server, even though all security, certs, spf etc. etc. are all setup correctly.
I have pm'ed him when he posted, no reply.