Default address in horde giving "no valid sender in header" error

[noimad1]

Hi,

I have a customer who is getting this error message when sending from horde. However, it only happens on his default account?

There was an error sending your message: Failed to send data [SMTP: Invalid response code received from server (code: 550, response: Administrative prohibition)]

then when i look in exim_mainlog it shows this:

2008-05-09 15:46:06 1JuZTi-0006XF-Kj H=localhost [127.0.0.1] F=<his@domain.com> rejected after DATA: there is no valid sender in any header line

Anyone else experienced this? All of his other e-mail accounts on the server send out fine?

[Kailash1]

Also check exim rejected mail logs. I think you should get some more help for this error.

Kailash