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1) Create a new e-mail 2) Start typing an address into the box 3) Press tab to move to the options 4) Press up/down arrow to select an option 5) Press enter to choose the option The email added has an interesting format of the e-mail address, then the e- mail address again without the bit you typed to generate the suggestions. E.g. If a contact Joe.Bloggs@isp.com exists Typing Joe would provide his e-mail as a suggestion. If selected as above, the to box would contain "To: <Joe.Bloggs@isp.com.Bloggs@isp.com>" which obviously doesn't send!!
I've reproduced the bug. FYI If you don't press tab it works ok.