Hi gmime experts; In notmuch we are using g_mime_parser_set_format (parser, GMIME_FORMAT_MBOX) to try to distinguish mboxes containing multiple messages from those containing only a single message [1]. The attached message breaks this, because it has an unescaped "From " inside a (text/plain) attachment. My question is if you consider this a gmime bug, or should mbox really take precedence over mime structure? I guess I can see both points of view, although it would be convenient for notmuch if gmime would consider wrapping in mime structure as a kind of escaping. cheers, David [1]: this is one of those regrettable backwards compatibility things. We tried to get rid of it about 7 years ago, and failed.