If you want someone to be able to email you from a door within your visitor room.....

ON SELECT {
"mailto:youremailhere@domain.net" NETGOTO }

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You can also specify the subject and/or body as follows:

ON SELECT {
"mailto:youraddy@whatever.com ?subject=put subject of message here &body=put body of message here" NETGOTO
}

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Maybe you just want a subject line included with nothing in the body.

ON SELECT {
"mailto:youraddy@whatever.com ?subject=put subject of message here" NETGOTO
}

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If you have an av donation room where they can make and donate props for their very own proproom on your server, you can put an ON SELECT script in a door like this....

ON SELECT {
NBRUSERPROPS n =
{ 0 i = " \["
{ " " i USERPROP ITOA & & i ++ }
{ i n < } WHILE " \] " & myprop =
"mailto:youraddy@whatever.com ?subject=Add this prop to your room&body=" myprop & NETGOTO
} n IF }

This will fill in the email for them and send it to you.

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One thing that Phil pointed out that I had forgotten about since I never use this command is that the NETGOTO/GOTOURL are functionally equivalent meaning either one will produce the same results.  You can just as easily use it in a script like this....

 ON SELECT {
"mailto:youremailhere@domain.net" GOTOURL }