My reply email address is being set incorrectly

[BrianTJ]

I have four email accounts set up in my outlook. When I reply to a received
email the reply account used for that email is normally NOT the email account
the email was sent to. It uses one of the others. I can change it by
changing the send from account but I often forget. How can I correct this
such that the reply is automatically sent from the email account the received
email was sent to?

BrianTJ

 

[BrianTJ]

Having read through other posts on this topic I'll add the following:

The email addresses are different names with the same domain name. The
emails go to a forwarding company that send the emails to a single account
with my ISP. When the emails arrive in our Outlook they have the original
TO: address which correrctly shows the recipient. Its wehn a reply is made
to the email that the from address isn;t taken from the email TO address but
one of the other accounts.