Cannot send out mail on second machine on the network. Error is :

Your server has unexpectedly terminated the connection. Possible causes
for this include server problems, network problems, or a long period of
inactivity. Account: 'mci hi speed', Server: 'smtpauth.mcihispeed.net',
Protocol: SMTP, Port: 25, Secure(SSL): No, Error Number: 0x800CCC0F

It's Win 98 SE machine
On other machine I can send and receive e-mail