Sending Private MOTD messages to Users from Server

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I have recently started a small Team Fortress 2 dedicated Windows Server on my PC for just a few friends to join. However if it may start to get popular, how would I send I private message to a user saying:
Welcome to my server <their Steam name>
Could I do this through a command in a cfg file or would I need some sort of server mod to send private messages with variables in (like their Steam name)?
Please ask if you need any more information.
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