Hi Benny, Apparently MailMate uses SHA1 for S/MIME signatures: Content-Type: multipart/signed; boundary="=_MailMate_9C9B7CEB-A063-4594-B53C-4CA40977FBE0_="; micalg=sha1;
SHA1 is not considered as secure anymore (https://en.wikipedia.org/wiki/SHA-1). I also noticed that Gmail doesn't verify SHA1-signed messages anymore: 'The signature uses an unsupported algorithm. The digital signature is not valid.' I don't know if you use a macOS library for S/MIME? A test from iOS Mail used SHA256: Content-Type: multipart/signed; boundary=Apple-Mail-2496A2C0-AD94-4608-8970-57B8A409367C; protocol="application/pkcs7-signature"; micalg=sha-256 Thanks, Jan -- Jan Münnich j...@dotplex.com | +49 30 20236996-1 dotplex GmbH | www.dotplex.de Reinhardtstr. 27c, 10117 Berlin, Germany AG Charlottenburg: HRB 173749 B | USt-IdNr.: DE304968794 Geschäftsführer: Jan Münnich
smime.p7s
Description: S/MIME digital signature
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