Throughwave definitely provides EAI addresses.  They don’t have a client and they are working on IMAP & POP support.

Though only the two you list have a complete suite of services as far as I know.   No one was there from OpenFind.

D

From: deepak <deepak.singhal@dil.in>
Date: Saturday, 15 April 2017 at 4:19 PM
To: Don Hollander <don.hollander@icann.org>, "`ua-eai@icann.org`" <ua-eai@icann.org>
Subject: [Ext] Re : [UA-EAI] EAI Readiness Spreadsheet

 Hi,

   Thanks Don to share this information. According this sheet only 2 mail server is fully compatible  to EAI.

    1. XgenPlus
    2. Coremail

Deepak Singhal

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From: Don Hollander <don.hollander@icann.org>  MailId : [68159261]
To: "ua-eai@icann.org" <ua-eai@icann.org>
Subject: [UA-EAI] EAI Readiness Spreadsheet
Date: 14 Apr 2017 09:42:20 PM

The following is a link to shared spreadsheet that records the assessment of EAI Readiness from our discussion in Seattle this week