Outlook not sending messages from correct POP3 account

[Melanie]

I am a tech support person, supporting several companies
from my home. Therefore, I have several pop3 email
accounts setup on my computer in Outlook.

When I reply to an email, I need to make sure that the
correct account shows up in the "From" field. This works
for some messages, but for others, the email is sent from
the wrong account (making me look real bad ). This
happens even when it says it's going to be sent from the
correct account, if I check the sent items afterward,
I'll see that it was sent from the wrong account.

This is driving me batty and I need a solution super-
quick.

Thanks.
Melanie

 

[Melanie - Update]

UPDATE:

After doing more digging, I have found that ALL the
emails that I reply to from the "DYD Dating Tips" account
are being sent from my "(e-mail address removed)" account.
Even though when I'm typing the message, it says it's
gonna be sent from the correct account "DYD Dating Tips".

PLEASE help me!!!! Thanks.

Melanie

 

[Melanie - Another Update :-\)]

Okay, I figured out that my default email account
is "iBackups", so that's why all my replies are being
sent throught that account.

Do I have to set a defualt? Is there any way to change
that?