Can't send email from Webfusion for 24 hours now - 421 Unexpected failure

Can someone tell me this isn't something I'm doing wrong?!? It's taken too many hours out of my life in the last 24 hours!

Yesterday morning, no-one could send email. Here's the error

From Telnet
------------------------------------
220 hosting.pipex.net SMTP Server
HELO NETPC
250 rubidium.webfusion.co.uk Hello host-X-9-X-1.X.com [X.9.X.1]
MAIL FROM: <mail@XXXXX.co.uk>
421 Unexpected failure, please try later
-------------------------------------

From OE log
-------------------------------------
SMTP: 07:40:27 [tx] HELO NETPC
SMTP: 07:40:27 [rx] 250 rubidium.webfusion.co.uk Hello host-X-9-X-1.X.com [X.9.X.1]
SMTP: 07:40:27 [tx] MAIL FROM: <mail@XXXXX.co.uk>
SMTP: 07:40:27 [rx] 421 Unexpected failure, please try later
SMTP: 07:40:27 [tx] QUIT
SMTP: 07:40:27 [rx] 221 rubidium.webfusion.co.uk closing connection

Note that the symptoms are identical, from OE or Thunderbird, from Bulldog or BT Broadband. We've created new accounts too and tried to send from them.

Pipex Webfusion are saying that it's definitely not their fault. I have to admit that when logged into my hosting server via SSH, I can send mail from the command line (via MAIL). But when logging in in a "normal" way via a client, this 421 error appears. Googling for this error, some people say it is because the /var mount is full, but I did a DF and that looks fine.

Any ideas? Thanks

 

 

 

 

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