Since you set "Max message size" to 0 for
S/MIME (and PDF), no email
will ever be S/MIME signed and or encrypted since every email will be
larger in size than 0. Since no S/MIME is required, no certificate is
requested. You should set the "Max message size" to something larger
than 0. What you probably expected was that 0 would mean "no limit".
Unfortunately it's currently not possible to specify that you do not
want any limit to you should select a large number (larger than the MTA
max message size) if you do not want any limit. I will see whether I can
allow -1 to mean "no limit".
You are right, works like a charm now :)
Indeed, I expected it to mean "no limit".
I don't think I'll really need a "no limit" option for production use,
was just for testing, but I think a 0 should be "no limit", as it's imho
counter-intuitive that it practically disables S/MIME or PDF.