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Sendmail: "unqualified hostname unknown; sleeping for retry unqualified hostname - linuxconfig.org
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Lubos
August 2, 2021, 1:13am
1
Sendmail hang or is very slow when sending an email.
This is a companion discussion topic for the original entry at
https://linuxconfig.org/sendmail-unqualified-hostname-unknown-sleeping-for-retry-unqualified-hostname/