aws ses, super cheap, fairly easy to setup. I just wish they had better or easier things like sendgrid has for analytics and troubleshooting. But i am paying pennies for my low sends.
> Gmail?
Yes. I use Thunderbird to browse the mail, but Gmail is the MX record. > You can add sending from other address/SMTP in the settings
Occasionally I do open a web browser to view the mail from there, so that might be useful. Thanks. But I still would have no way to alter the From header in the web interface.