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how to make windows live mail send fdqn instead of netbios name?

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http://serverfault.com – Our Thunderbird and Mac Mail clients send a HELO message via SMTP containing their FDQN to our mail servers. The mail servers are both Postfix and everything works smoothly until we run a Windows Live Mail client from a PC on the network. This email client sends a HELO containing the PC's NETBIOS name which is of course rejected by Postfix with `RCPT from iainmacbook.home[192.168.1.69]: 504 5.5.2 <IAINHOUSTON4915>: Helo command rejected: need fully-qualified hostname;` This is a PC that has just had Win 7 loaded onto it followed by Windows Live Mail client for testing, so a (HowTos)