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simonmason
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UNIX for Dummies Questions & Answers
04-21-2009
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Sendmail error: 550 5.1.8 invalid/host-not-in-DNS
9,740
Posted By
simonmason
Sendmail error: 550 5.1.8 invalid/host-not-in-DNS
I have sendmail setup to relay through my external ISP. Everything was working fine until I started getting the error message (below). I don't what I did to cause this? I have read a number of...
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