Since I have been using the iPhone 3G, email has been working perfectly until this morning. I have Outlook set to retrieve email via POP and my iPhone using IMAP. All of a sudden, I am receiving a copy of emails sent via the iPhone in my Outlook Inbox. This issue is definitely common, especially when connecting to a Gmail account using multiple clients such as an iPhone, web browser and Outlook. It is a known issue and well document here:
My problem is a slightly different as it is happening on a non-Gmail account and the problem was non-existent until today. After some digging around, it looks like my iPhone’s setting got changed. Not sure how or why but there is a simple fix. On your iPhone, go to:
Settings >> Mail, Contacts, Calendars, there is a setting called “Always Bcc Myself”
For some reason, this was set to “on.” I disabled this and all is well again, no more duplicate emails being sent to my Outlook Inbox when I reply to an email from my iPhone. If you are also experiencing this duplicate email issue when sending emails on an iPhone, try this simple fix.