I see other posts about duplicate emails being received on their phones, I have the opposite problem - my recipients get 2 copies of every email I send from my phone.
I use the native app, it's a Hotmail account. The email is identical - time-stamped the same. There is only one copy in the Sent folder on the phone. This is the default account on the phone.
I have an S3 and this seems to have started with the recent push system push from Verizon that I installed in early May. Device is on Android 4.3.
Any ideas how I can stop this as it's very irritating to my recipients and costly against my data plan (please read that Verizon).