How to turn OFF "Improper folded header field made up entirely of whitespace"

[Mike Schleif]

Why does adding "allow_fixing_improper_header_folding" to
"$policy_bank{'MYNETS'}" NOT fix this problem for outgoing email?

$policy_bank{'MYNETS'} = {
  allow_fixing_improper_header_folding => 0,
  originating => 1,
  os_fingerprint_method => undef,
};


On Wed, May 18, 2016 at 8:49 AM, Mike Schleif <mike at mdsresource.net> wrote:

> postfix 2.10.1
>
> How can I turn OFF the following particular header check ONLY for outgoing
> email?
>     "Improper folded header field made up entirely of whitespace"
>
> We're using postfix between the internet and MS Exchange 2010, and MS
> Outlook 2010 MUA.
>
> Several times per week, outgoing mail is quarantined for this header
> violation, always in the References: header, example below:
>
> ...
> References: <
> BY1PR13MB0151F1E18A901505CAE7F071CC710 at BY1PR13MB0151.namprd13.prod.outlook.com
> >
>  <1F13EA4287F2B24EA0E390BCFD313E7AB8A51E8D at SemExchange.sempris.local>
>  <
> BY1PR13MB01510E8FAC2AA3D5241F8BD4CC710 at BY1PR13MB0151.namprd13.prod.outlook.com
> >
>
> Accept-Language: en-US
> ...
>
> We do not want to turn header checks off completely. Incoming email is not
> a problem for us.
>
> For internal automated emails from legacy systems, we have already
> implemented:
>   $interface_policy{'10027'}   = 'SENDERBYPASS';
>   $policy_bank{'SENDERBYPASS'} = {
>     bypass_header_checks_maps  => [1],
>     final_bad_header_destiny   => D_PASS,
>    ... }
> via: /etc/postfix/amavis_sender_bypass
>
> How can we turn OFF only this one header check for all outbound email?
>
>
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