leam hall:
> Apr 29 15:37:26 client sendmail[15767]: s3TJbQGQ015767:
> s3TJbQGR015767: DSN: Host unknown (Name server: 2.3.4.5: host not
> found)

That is Sendmail not Postfix. Is is unable to deliver some mail.

> Apr 29 15:37:26 client postfix/smtpd[15771]: connect from
> localhost.localdomain[127.0.0.1]

That is Postfix. It is receiving a "delivery error report"
from Sendmail.

This machine runs both Postfix and Sendmail. You need to fix that
first. How? That depends on the OS distribution that you are using.

        Wietse

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