Welcome to DroidForums, YourMomsandMe! With more details, we might be able to troubleshoot what the problem /solution is. What kind of phone, email client, are all emails duplicating, etc.?
Sent from my SM-N920V using Tapatalk
Strange no one responded to TisMyDroid....
I have the same issue with my phone doubling the sent body content. It seems they're sent to the recipients, because when the recipients reply, the doubles are also there in the thread of previous replies in the one message. The original msg that's sent from my phone is in a pink/purple bold font, and the duplicated msg shows as the default regular black font, if that's indicative of anything.
I, however, just attempted to email myself today from three different yahoo accounts and a college campus email using the same mobile Email account set up as the Yahoo accounts, as well as a GMAIL account -- none of them had duplicated the body. Although I have recent mail in my inbox that shows doubled-bodies -- I don't know what is the determining factor(s) in whether a body gets doubled or not when I send, only the consistency is that it only occurs when sent from my phone's Email accounts.. and I think only if Yahoo server was used.
I already checked my Yahoo settings as instructed from Yahoo help pages to find in my account about storing POP mail on the yahoo server and couldn't find it to dis-enable. This also had occurred regardless of "conversation thread" setting, as I did not have that set up when it first occurred (but now do, which only groups when I'm logging in on a computer. Mobile's Email still lists as individual messages).
Phone: Droid Razr Maxx
Mail: Yahoo servers via mobile "Email" Accounts
Issue: Body content from sender (me) duplicated in same msg
Addt'l settings info on Yahoo servers via mobile "Email" accounts:
Incoming: android.imap.mail.yahoo.com / Port 993, SSL, PLAIN authenticaion.
Outgoing: android.smtp.mail.yahoo.com / Port 465, SSL, PLAIN authentication