3Com SUPERSTACK 3 WEBCACHE 3000 User Manual page 226

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HAPTER ERFORMANCE ONITORING
12 In the Realm/Domain Name field, you can enter the Unix realm or
Windows domain that the SMTP user belongs to, or leave the field blank.
For further information about how SMTP Authentication operates on the
Webcache, see "SMTP Authentication" on page 210.
You can send a test email to the SMTP server immediately by clicking
Send Now. You may want to do this to test that the Email Graphs settings
are correct. The Webcache will indicate if the test email has been sent
successfully or not. If there is a problem it may take up to one minute for
the Send Now operation to time out depending on the type of problem.