I think there are some listed list domains in server which are not allowed for relaying mail. What i suppose if hotmail.com is not in the list of allowed realying list then you would facing such problem. I earlier had the same problem where i was trying
to send mail to my friend who has an account on different server i got the same error. When i searched i found that godaddy server dont allows mail to be sent to an untrusted server.
riteshtandon...
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Re: Mailbox unavailable. The server response was: 5.7.1 Unable to relay for unixpeter@hotmail.com...
Jul 07, 2011 04:38 AM|LINK
Hi,
I think there are some listed list domains in server which are not allowed for relaying mail. What i suppose if hotmail.com is not in the list of allowed realying list then you would facing such problem. I earlier had the same problem where i was trying to send mail to my friend who has an account on different server i got the same error. When i searched i found that godaddy server dont allows mail to be sent to an untrusted server.
Thanx
Ritessh (http:\\www.jalandharsearch.com)