how do i add user signature to a system email template? Im trying to add signature of a sales person when we send an email to a contact i tried this but it didnt work ${entity.company.salesrep.preferences.MESSAGE_SIGNATURE}

${preferences.MESSAGE_SIGNATURE} is all you need if you want it to come from the sender. Alternatively you can use ${salesrep.preferences.MESSAGE_SIGNATURE} I think.

but the email is being send from a contact record. Contacts dont have sales reps assigned to them

you've tried it and it doesn't work?

correct

add a field to the contact records that sources the sales rep and reference that instead