Mail and Gmail

[jeykey]

I have 2 Gmail accounts in Mail. Yesterday I sent an e-mail from one of the recipients, after receiving the reply, the reply e-mail has got the sender as being from the other account. So it´s in the inbox of a different account I sent it from. I have noticed this wash´t the 1st time this happened; why ? How do I eliminate this from happening ?
The 1st time I noticed this I thought, maybe I didn´t switch accounts when writing the new message, but no, it´s some kind of bug.

 

[twintin]

I don't recall I have not encountered this.

If you check the sent mail box, on what account's sent mail is it stored ?

 

[jeykey]

In the sent folder it is stored in the recipient I wanted it sent from, but the received message is stored on the other account. I 1st noticed this in ML, now I have 10.9.1