How can I keep my signature on the left side when using rtl on mail application

Try selecting only the sig and going to Format > Alignment > Writing Direction.

Joni11 wrote:

You have another solutions ?

I kind of doubt there is one, but you could try playing with the html rtl/ltr codes in the html for your sig.

Joni11 wrote:

How could i do this?

Sorry, I don't know. But have you already tried selecting your sig and using the usual alignment tools? It seems to work for me when used in the new message pane.

You could create a custom stationery perhaps. But that has to be selected every time you write a new email too...