SMTP protocol makes no provision for keeping sent emails. Yahoo keeps a copy regardless.
Yahoo now keeps SMTP sent emails (Like Outlook or IOS client) in SENT folder where it did not years ago. SMTP protocol makes no provision to do that. I already have my SENT emails in my Outbox. I use Yahoo SMTP to send alarms from my in home security cameras and this makes duplicates. Just provide option in Settings to NOT keep a copy of SENT emails when using SMTP
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