I can choose a password such as 'The name of uncle Robert's favorite movie' (i.e. something that it's easy for her, but hard for everyone else).
OR
I can call her, and say: 'Just sent you a password-protected file. The password is 'Foobar'
I can include the password in the email itself (doesn't protect from an attacker but protects from mail provider snooping/indexing emails).
It doesn't make my communications NSA proof. It adds a little bit of privacy. For the specific use-case, it's more than enough.
I can choose a password such as 'The name of uncle Robert's favorite movie' (i.e. something that it's easy for her, but hard for everyone else).
OR
I can call her, and say: 'Just sent you a password-protected file. The password is 'Foobar'
OR
I can include the password in the email itself (doesn't protect from an attacker but protects from mail provider snooping/indexing emails).
It doesn't make my communications NSA proof. It adds a little bit of privacy. For the specific use-case, it's more than enough.