Invalid sender domain - strange error, any ideas?

[Dan Klinge]

Your message did not reach some or all of the intended recipients.

Subject: RE: Boat

Sent: 4/17/2006 11:19 AM

The following recipient(s) could not be reached:

'(e-mail address removed)' on 4/17/2006 11:19 AM

554 (e-mail address removed): Recipient address rejected: invalid sender domain

 

[Brian Tillman]

Your message did not reach some or all of the intended recipients.

Subject: RE: Boat

Sent: 4/17/2006 11:19 AM

The following recipient(s) could not be reached:

'(e-mail address removed)' on 4/17/2006 11:19 AM

554 (e-mail address removed): Recipient address rejected: invalid sender
domain

This says that your recipient has a filter in place that is rejecting the
domain your sending address is using.