[Tickets #14574] Invalid Received header

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Ticket URL: https://bugs.horde.org/ticket/14574
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  Ticket             | 14574
  Created By         | azurit at pobox.sk
  Summary            | Invalid Received header
  Queue              | IMP
  Version            | 6.2.17
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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azurit at pobox.sk (2017-02-06 19:00) wrote:

IMP is generating this Received header which contains IP address of a client:

Received: from 1.2.3.4 ([1.2.3.4]) by webmail.example.com
  (Horde Framework) with HTTPS; Mon, 06 Feb 2017 13:00:50 +0100

The problem is that the first IP address (within no brackets) is  
supposed to be an HELO/EHLO string. If HELO/EHLO is an IP address, it  
must be inside "[" and "]" brackets. The headers should look like this:

Received: from [1.2.3.4] ([1.2.3.4]) by webmail.example.com
  (Horde Framework) with HTTPS; Mon, 06 Feb 2017 13:00:50 +0100

Current format is doing problems for example with SpamAssassin:  
E-mails are fireing RCVD_NUMERIC_HELO and FSL_HELO_BARE_IP_2 spam  
checks. You can try it here:
http://spamcheck.postmarkapp.com/