just a heads up, in the latest version of Webmin/Virtual min, under the Sendmail Module, under its options page,
if you scroll down to "Max recipients per message" and click the link to "read more", it returns with:
Failed to read help file /usr/share/webmin/sendmail/help/opt_MaxRecipientsPerMessage.html
the file not found error appears to orignate from this URL: https://mywebsite.com:10000/help.cgi/sendmail/opt_MaxRecipientsPerMessage
thanks!
Thanks - this will be fixed in the next Webmin release.