QUOTE
The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'XXX@XXX.XXX'. Subject 'XXX', Account: 'XXX', Server: 'mail.XXX.XXX', Protocol: SMTP, Server Response: '451 Temporary local problem - please try later', Port: 25, Secure(SSL): No, Server Error: 451, Error Number: 0x800CCC79
where all of the XXXs are the relevant pieces of information. Figuring it to be a "temporary local problem" I initially shrugged and left it for a little while. I tried again about 6 hours later, and again just now (around 24 hours later), so either it's less temporary than it says or something else is wrong.
Wondering whether it was to do with the actual email address I sent it to, I sent an email to my hotmail account (which I know to be functioning fine) only to receive the same error. I then reversed the process, sending an email from my hotmail account to my one hosted at AstaHost. During the "connecting, authorizing, checking mail" stages I received no indication that a mail had been sent.
This leads me to believe that the problem is due to some option changing with the new server. Has anyone else had similar problems? If so, how did you get around it? If not, what could possibly be wrong my end and have you any suggestions as to how to fix it? Naturally I've tried using the automatic configuration given in cPanel to automatically change any settings that needed doing, but nothing different seems to happen.
I should probably also point out that when directly accessing the webmail (via cPanel) there was also no indication of having received anything from my hotmail account. I'll see soon enough if the mail bounces, but as of the time of writing this it seems to have sent fine. It does make me wonder a little, as I never had any problems prior to the move...
Thanks in advance,
Mordent
) email address, as well as a couple others that I use fairly regularly, so it's quite important it gets resolved. 
