Sendmail fails to relay mails through smart host with the error 'generic SSL error' in maillog.

Solution Verified - Updated -

Issue

  • Sendmail do not relay mails through smart host. The following SSL errors are seen in maillog when the issue occurs:

    Feb 12 22:59:52 servername sendmail[2733]: STARTTLS=client, relay=email1.smarthost.com., version=TLSv1/SSLv3, verify=FAIL, cipher=DES-CBC3-SHA, bits=168/168
Feb 12 22:59:52 servername sendmail[2733]: STARTTLS: read error=generic SSL error (-1), errno=0, get_error=error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number, retry=1, ssl_err=1

Environment

  • Red Hat Enterprise Linux Server (RHEL)
  • sendmail

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