451 Temporary local problem - please try later

[Nell]

I connect via Vodacom 3G HSPDA

Can someone maybe help with this error message?

I'm connected via outlook configured to my own domain e-mail address.

Everything used to work fine.

But as of last week I get this error returned when I try and send via Outlook.

However I can receive ok on Outlook.

 

[NetSpike]

Had same problem just now and restarted ClamAV on mail server. You may need to contact your ISP. This is a problem on the mail server, not with your mail client (Outlook).