sendmail expands the recipient domainname into the canonical name

Solution Verified - Updated -

Issue

  • sendmail expands the recipient domainname into the canonical name automatically, which defined in DNS CNAME record.
  • mail command is used to send a mail.
  • sendmail.mc has the following configuration, sendmail.cf was recreated.
define(`confDONT_EXPAND_CNAMES', `True')

Environment

Red Hat Enterprise Linux 5

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