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451 All MX servers are unavailable

Hi,

When i send to one particular domain i get this error for our users. anybody know how to fix this one?
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mtevansmtgoat
Asked:
mtevansmtgoat
1 Solution
 
EastThamesCommented:
SMTP code 451 is due to an error on the server you are sending the email to. Could be because they are having problems, or are using an anti spam technic called grey-listing, or have black listed you and are not accepting your connection.
Check you can send via gmail, and have a look at the smtp transaction logs at your end.
Get in contact with the remote email administrators to help you out.
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