How to send mail from alias address
I'm on El Capitan. I'm trying to send an email from the mac app, not icloud, using an alias I already have. I've found out how to do this in icloud. When I try to write a new email in the mac app, it opens a blank email with only a To address and Subject fields, no From address. There is an apple help thing about it which says -
- In the Subject field, type a subject for the email.
- Click the From pop-up menu, then choose an alias email address.This is the address that the recipient will see.
But I can't see any 'pop-up menu' for the alias. I've tried doing Control-click on the blank email form and 'customise toolbar', but I don't see anything which might be for the From field. Please can anyone help.
Mac mini, OS X El Capitan (10.11.6)