Submission Service Copy To Sent

[Asai]

Greetings,

We've had a longstanding problem with emails not being copied to the 
Sent folder that seems to be a bug with various email clients 
(Thunderbird, TypeApp.)

I know that Dovecot has the option to use the Submission service to copy 
emails to Sent without using SMTP to do this.

Would this solve the problem we've seen over the years of emails not 
being copied to the Sent folder on various clients under certain 
(unknown) conditions?

Thanks for your insight here.

Asai