host map: lookup ( ): deferred

It is the log info in mailq.

NOQUEUE: SYSERR(root): opendaemonsocket: daemon MTA: server SMTP socket wedged: exiting

It is the log at /etc/log/maillog

I use sendmail to send mail. I can use 'mail' to mail to local users, but I cannot mail to others. For example, I sent a mail to example@gmail.com, which could not run. A mail to root can be sent and received.

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