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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Happy #NoEmailDay – The case of the 500-mile email

Posted by jpluimers on 2017/07/07

Good reading on #NoEmailDay 2017: The case of the 500-mile email [WayBack] on how a sysadmin in the mid 1990s found the cause of not being able to send email further than roughly 500 miles.

The exact mile unit doesn’t matter as it was all approximation. Read the FAQ on the 500-mile email [WayBack]



PS: some sendmail tricks from


sendmail -q -v

sendmail -OTimeout.hoststatus=0m -q -v

sendmail -OTimeout.ident=0 -OTimeout.hoststatus=0m -OTimeout.iconnect=5s -OTimeout.connect=1m -OTimeout.helo=1m -OTimeout.mail=1m -OTimeout.datainit=1m -q -v

sendmail -OTimeout.ident=0 -OTimeout.hoststatus=0m -OTimeout.iconnect=5s -OTimeout.connect=10s -OTimeout.helo=10s -OTimeout.mail=10s -OTimeout.datainit=1m -q -v

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