Exim error... what does it mean?

What does that mean?

1 name@domain.com F=
R=lookuphost T=remote_smtp: SMTP error from remote
mailer after end of data: host mail.domain.com [206.63.xxx.xxx]:
550 5.7.1 Requested action not taken: message refused

2 name@domain.com F= R=lookuphost
T=remote_smtp: SMTP error from remote mailer after
end of data: host mail.domain.com [206.63.xxx.xxx]:
550 5.7.1 Requested action not taken: message refused

Is it related to the fact that I checked "verify sender" in cPanel?

 

 

 

 

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