Sending mail takes a long time and email is sent out only once per hour

Solution Verified - Updated -

Issue

Sending out email using certain user accounts on one server takes a very long time and email is sent out only once per hour.

  • There are multiple servers.that are all identically configured.and running sendmail, however only one server is encountering this issue.
  • The issue is the same regardless of whether the message is sent internally or externally

Environment

Red Hat Enterprise Linux 5

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