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MH Frequently Asked Questions (FAQ) with Answers
Section - 06.10 Fixing "Sender didn't use the HELO protocol"

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Date: Tue, 20 Mar 2001 22:01:16 -0800

  If you are sharing your $MHLIB/mts.conf (mtstailor) file among
  several machines, and you are connecting to the local sendmail, then
  use 'localhost' as the hostname argument to the clientname parameter
  (described below).

  Otherwise, place mts.conf somewhere under /etc on each system, and
  install a symlink to it on the shared file system.

From: labrown at dg-rtp.dg.com (Lance A. Brown)
Date: 23 Apr 1996 14:43:04 -0400

  You can solve this by putting

    localname:      localhostname
    localdomain:    local.domain.name

  in your $MHLIB/mts.conf (mtstailor) file. This will make MH send a
  HELO string in the SMTP transaction.

From: Terry Manderson <terry at azure.dstc.edu.au>
Date: Mon, 1 May 1995 00:00:00 -0800

  Add

    clientname sender

  to $MHLIB/mts.conf (mtstailor) where sender is the name of the
  machine sending the message. The error message occurs because newer
  MTA's require SMTP's "HELO" command which MH omits in some
  configurations. When you add the above line, it forces MH to use the
  HELO command.

From: Bill Wohler <wohler at newt.com>
Date: Fri, 1 Mar 1991 13:03:15 -0800

  You get a header like:

    X-Authentication-Warning: screamer.rtp.ericsson.se: Host
    rcur7.rtp.ericsson.se didn't use HELO protocol

  Easy possibilities are: apply the patch to MH that comes with
  Sendmail 8.X.X and makes it use HELO, or comment out the line that
  says

    Opauthwarnings

  in your sendmail.cf.

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