Updated FAQ

FAQ.md

@@ -717,6 +717,9 @@ Note that certificates can contains multiple keys for multiple purposes,  for ex
 Android only imports the first key, so to import all the keys, the certificate must first be split.
 This is not very trivial and you are advised to ask the certificate supplier for support.
 
+Note that S/MIME signing with other algorithms than RSA is supported, but be aware that other email clients might not support this.
+S/MIME encryption is possible with symmetric algorithms only, which means in practice using RSA.
+
 The default encryption method is PGP, but the last used encryption method will be remembered for the selected identity for the next time.
 You might need to enable the send options in the three dots menu again to be able to select the encryption method.