If you’ve noticed that your email seems to be acting funky lately, such as that replies from people to whom you have sent email aren’t showing up where they should, or that people aren’t getting email that you send from your Android phone, the culprit could well be that your Android phone is no longer using your default “From” address (your “send mail as” address) that you have set in Gmail. Thanks to an issue with the latest Android update, Android phones are not longer honoring your selection of default From address, and are instead defaulting to using your Gmail account email address.