Bug 616229 - crash [@ nsMsgXFGroupThread::SetMsgHdrAt(unsigned int, nsIMsgDBHdr*)]. r=irving

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extra : rebase_source : 7028f59863ee195368765ddeb88f49ea39a33d4e
Bug 809990 - Don't set the offline folder flag for SPAM and TRASH folders. r=irving
Bug 655428 - add ReplyTo to default IMAP headers, r=irving