After updating to the new Post SMTP can’t send from different address

Hi there,
I’ve been using for a few years the great old plugin. And few days ago I decided to move on, delete the old plugin and install the newer version.
Now, I’m sending via SMTP connected in oauth 2.0 to my Gmail account.
In Gmail, I can send from a different domain as my main address. For example:
My domain in Gmail is “santur.co.il”, but it is set that I can also send it from “ethnimusical.com”.
In the Post SMTP settings, I have hi.com as the “from” address.
The issue is that the mail is being sent from the default hello.com domain, although I’ve clearly set it to be sent from hi.com.
Why is this happening? And is it sure that I need to add SPF record to ethnicmusical.com so I can keep sending mails from that domain?
If yes, can you point me to an article explaining the process?
Looking forward to hearing from you!
Many thanks
Daniel

• This topic was modified 4 years ago by dk9.