$sslcertvalid Returns $true if the IRC network's SSL certificate is valid for the current SSL connection. Returns $false if not connected or connection is non-SSL.
//if (($server) && (+* iswm $port)) echo -a current SSL connection is $iif($sslcertvalid,valid,invalid)
Added: mIRC v7.58
Added on: 17 Nov 2019
Note: Unless otherwise stated, this was the date of original functionality.
Further enhancements may have been made in later versions.