"Raul" wrote in message
...

I have two email accounts which I open in Outlook. problkem is when I reply
to an email from the secondary account it always gets posted in the SENT of
the primary account.

Folder sets and not accounts. Multiple POP accounts in Outlook all use the
same folder set by default. There's only one Sent Items folder for POP
accounts.

Can I write a rule to MOVE it to the appropiate account? How?

You can create a rule to move a copy of outgoing messages to another _folder_,
not to another account.
--
Brian Tillman [MVP-Outlook]