The mutt source code contains this:
if (!ascii_strcasecmp ((t+len), "p7m"))
#if 0
return SMIMEENCRYPT;
#else
/* Not sure if this is the correct thing to do, but
it's required for compatibility with Outlook */
return (SMIMESIGN|SMIMEOPAQUE);
#endif
else if (!ascii_strcasecmp ((t+len), "p7s"))
return (SMIMESIGN|SMIMEOPAQUE);
This is definately *not* the right thing to do. See RFC 2633, section
3.2.1--a .p7m extension should be interpreted as enveloped data. I
suggest changing the #if 0 to #if 1. It may break compatibility with
some version of outlook, but it will restore compatibility for RFC
compliant encrypted messages.
--
Michael Stone
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