[vchkpw] smtp;553 sorry, sorry, that domain isn't allowed relay (#5.7.1)

[songrit]

Hi,   i use hotmail send email to my qmail server  my server return message "smtp;553 sorry, sorry, that domain isn't allowed relay (#5.7.1)" when i delete domain and add this domain again. my server can recieve normal. what happend ?   sorry for my english.   Thank you, Songrit Srilasak