e-mail query

[rich 36]

When replying to any outlook express addresses that pop un when i respond to say a car trader, or individual selling cars. my computer says,
message not sent, check news account settings.
What do i have to do to mend this, and it wont' affect
my hotmail account will it either
thanks rich

[Jay-Aim]

in your message top line ie "From:"

select your mail account