Problem with all mail being sent twice when using sedit

Hi,

I've got a somewhat strange problem with all outbound mail being sent 
 twice, but only if the following conditions are met:
 - I use exmh&sedit (eg with comp/repl from the commandline 
   everything's normal)
 - I use kuvert_submit[0] as "sendmail" in /etc/nmh/mts.conf (eg using
   postfix' /usr/sbin/sendmail works normally)
 - I use the "intelligent" sign feature in sedit (eg if I tell it
   "Sign... -> none" everything's normal)

An interesting bit is that the first mail does _not_ have my .signature 
 appended, but the second one does, so I somehow suspect sedit doing 
 something really strange here when signing.

Config for Simple Editor is:
 Automatucally sign: On
 Put a '--' before signature: On
 Where to position: end
 Deafult signature file: ~/.signature

Editor support:
 Editor command: sedit
 Auto Whom: Off
 Sedit override: Off
 Use sedit after Async: Off

exmh is 1:2.7.2-16 (debian), nmh 1.2-3.

Any hints?

0: kuvert is a wrapper that takes care of GnuPG signing/encrypting, see
   http://snafu.priv.at/mystuff/kuvert/

cheers,
&rw

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