My email address/hostname (slightly off-topic)

[Dennis Herbst]

I have been using my Yahoo Web based email address, and yahoo.com as my
host name. I noticed a few  emails marked  as  'Delivery Failure' in my
inbox at Yahoo Mail.. Am I doing something wrong by using this type of
configuration?  If so I will change it...

TIA

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RH 5.1
2.2.6 i686