Why does sendmail append domain name at the end of the e-mail address of the receiver?

Solution Verified - Updated -

Issue

  • Why does sendmail append domain name at the end of the e-mail address of the receiver?

Environment

  • Red Hat Enterprise Linux 5.7
  • sendmail-8.13.8-8.1.el5_7.x86_64
  • sendmail-cf-8.13.8-8.1.el5_7.x86_64

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