POP3 mail problem

[Balaji Hare Ram Balaji]

iam running qmail on linux 6.1
on we based mail , wroking fine
when try to get mails from POP3 mails,

iam getting this error.

An error occured while sending mail.
the mailserver responded.
sorry that domain isn't in my list of allowed rcpthosts (#5.7.1)
please check the meessage recipients and try again

help please