Make Subject Field in SMTP optional

Tags: #<Tag:0x00007f73ad469a88>

I use SMTP to send SMS messages via my cellular-provided messaging email… when a subject is not entered it automatically includes Home Assistant… when this is read by Siri in my car on my way home (my use of smtp)… it sounds silly…
It would be nice if the subject line was optional so it can be turned off completely, it seems it pulls the subject line from the default “notify” component as a fallback…
I have edited smtp for my purposes, but it would be nice if it just let you turn it off completely with a Boolean or something…