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.
Who is Participating?
bbaoConnect With a Mentor IT ConsultantCommented:
are you sure a picture was attached? :-)
bbaoIT ConsultantCommented:
what's your email software and where is message from?
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
Could you please post the full email header?
zvikaleAuthor Commented:
attached jpg file
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