Here are more comprehensive details of what I've observed - as far as I can tell I can't solve this one myself and the problem needs escalation:
Since Tuesday morning (Jan 22 - UK time) all redirection of mail for my domain (hosted on absolut) has stopped. I can still see incoming email by logging into my x10hosting webmail. Redirection was working fine for several weeks before it failed.
At the same time if I attempt to send anything out using x10hosting webmail it never reaches its destination and a day later I get the following [the example is the reply to my first test message]:
[Subject] Warning: message 1TxwZL-0005N8-4m delayed 24 hours
This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 24 hours on the queue on absolut.x10hosting.com.
The message identifier is: 1TxwZL-0005N8-4m
The date of the message is: Wed, 23 Jan 2013 09:26:06 +0000
The subject of the message is: test 89
The address to which the message has not yet been delivered is:
xxx@yahoo.co.uk
(ultimately generated from
david@xxx.org.uk)
Delay reason: SMTP error from remote mail server after RCPT TO:<xxx@yahoo.co.uk>:
host 198.91.80.251 [198.91.80.251]: 421 4.3.2 Service shutting down, closing channel
No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.
Mail sent direct to my Yahoo account gets through, as does mail to my other domain (hosted by a different provider). I have added other redirects, including to a non-Yahoo account, and the result is always the same - my domain on x10hosting never forwards, my other one always does.
It looks like something's going on at the server that I can't fix. [Edit: the searches I've done point to a failure of the server's antivirus/firewall process as a likely cause, don't know if this helps the diagnosis?] Can you help?
TIA,
David.