Hi,
I use a e-mail password with special chars - but monit does not accept / can't handle this.
Therefore the password needs to be in qoutes - I used single quotes and it seems to work. (the monit manual sates somewhere else to use duoble quotes...)
Here's the fix for the template (/usr/local/opnsense/service/templates/OPNsense/Monit/monitrc):
Line 19: {% set password = "password " ~ "'" ~ OPNsense.monit.general.password ~ "'" %}
Cheers,
Stephan