Opend a new bug report for the About not visible problem.
Therefore removing it from here.

Also made the title more specific.

Please see also issue 0001987 (http://www.sogo.nu/bugs/view.php?id=1987).

I home some example of header leading to the same result.

I tried some test with NGImap4Client/NGImap4ResponseParser but I'm not fluent enough in objective-c to get any result.
Moreover, please disregard the notes associated to the bug .. I was upset against sogo/sope devs at the time :)....

What I not understand is :
1) why sogo/sope does not treat in a sensible way the raised exception (NGImap4ParserException)
2) why there is no display to the user when such error occurs.

Hi! I have the same issues with multiple emails sent by amazon.

I get two messages in my log like:
<...[UIxEnvelopeAddressFormatter]> unexpected envelope address:...[NGImap4EnvelopeAddress]

All works when accessing the imap folder by i.e. thunderbird, but sogo displays no mail.
Please test it with the attached mail "badmail_amazon.eml"

My system is: Ubuntu 12.04
dovecot 2.0.19
sogo 2.0.3a-1

It would be very nice if someone could take a look over this problem.
best regards,
Bernhard

Fixed. Please try the next nightly build tomorrow.

See https://github.com/inverse-inc/sogo/commit/0408415c61f572ab859c58f44c1d5a028b3fbef7