In general it makes no sense to sign messages send to a mailing list, but I don't want to discuss this, I'm aware that some people have bizarre arguments, why signing mails to mailing lists makes sense. Anyway, if you send a signed message, than please use a format averaged MUAs support by default. TIA On Fri, 2015-08-28 at 00:11 +0100, flow wrote: > Content-Type: multipart/signed; micalg=pgp-sha512; > Content-Disposition: inline Claws doesn't display your message. Evolution does display your message, but displays a read warning "Unsupported signature format". On Wed, 2015-08-26 at 23:18 +0100, flow wrote: > Content-Type: text/plain; charset=koi8-r > Content-Disposition: inline This mail is signed too, but Claws and Evolution display your message without a warning.