When I perform whois on someone who is connected with SSL on bahamut the line '<nick> is using a secure connection (SSL)' is sent to the status window.

<- :irc.server.com 311 <nickname> <nickname> me 212.some.host.com * :realaname
<- :irc.server.com 319 <nickname> <nickname> :#channel1
<- :irc.server.com 312 <nickname> <nickname> irc.server.com :Default Server
<- :irc.server.com 307 <nickname> <nickname> :has identified for this nick
<- :irc.server.com 275 <nickname> <nickname> :is using a secure connection (SSL)
<- :irc.server.com 317 <nickname> <nickname> 1056 1355433259 :seconds idle, signon time
<- :irc.server.com 318 <nickname> <nickname> :End of /WHOIS list.

IRCD Version: bahamut-1.8.9

mIRC should show the 275 numeric on whois line.