I send email using my own MTA (SMTP server), from local interactive MUAs. I figured you were planning on sending the email to some other server that gets everyone's email (a problem in itself), but that was not at all what I was getting at
the point I was concerned about was developing a technique for solving a real problem that, in this specific case, wouldn't incur any significant disadvantages, but that might then become such a habit that you would no longer think whether the same preconditions applied, or even that would keep you from switching to a generally superior and safer communications infrastructure if it didn't happen to support this workflow. that kind of behavioral trap is something I'm often alert to and try to avoid, to keep my freedom, and that of others who would listen to me