when replying on income messages i get an error: 530 5.7.1 Relaying not allowed

the error occurs only on replying.
a direct send does not producing any error.
zvikaleAsked:
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bbaoConnect With a Mentor IT ConsultantCommented:
are you sure a picture was attached? :-)
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bbaoIT ConsultantCommented:
what's your email software and where is message from?
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zvikaleAuthor Commented:
email software: Microsoft outlook 2003.
it happends on every incoming message, while i'm trying to reply.
it doesn't when i'm sending the same target directly
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peeaCommented:
Could you please post the full email header?
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zvikaleAuthor Commented:
attached jpg file
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