Don and Andre
List below need some MAJOR corrections for clear understanding..
EAI Email Providers - would probably mean A company / product which can offer EAI mailbox on IDN domain. Not simply receiving or sending email to EAI.
•Microsoft - (you mean office365, its still not EAI provider, supports EAI)
•Google - ( you mean gmail, and its still not EAI provider, supports EAI)
•Apple - ( apple do not offer EAI and iphone do not support configuration of EAI account, EAI Mail app on IOS does )
•Yandex (Russia) - ( do not offer EAI )
•Coremail (China) - ( looks like you are testing it, however not yet available on their website commercially for public)
•XgenPlus (India) - ( commercially available)
•Throughway (Thailand) ( not aware, however their presentation shows they are using gmail as client to send and receive)
•SaudiNic (Not aware)
•OpenFind (Taiwan) - (on thier website https://www.mailcloudcom.tw/, they are not offering EAI (google search))
•Horde (USA) (https://www.horde.org/apps/webmail - its only webmail, need EAI server at backend like XGENPLUS)
•PostFix (Global) - (PostFix is only MTA, neither has IMAP/POP/Webmail, so cant offer EAI without other supporting client)
•Afilias ( dont know status - public information not available )
•Exim ( just like postfix)
•Sendmail (just like postfix)
So,
EAI Service Providers are only few as of now i.e XgenPlus - Fully available Globally (not only in India) in public domain (free and paid), CoreMail and Throughway seems to be available in test mode.
May be we create two lists,, 1) EAI Service Provider and 2) Products / Services Supporting EAI
Also include Android Phone Mail client and Microsoft Outlook 2016, which can allow configuration of EAI, if supported by EAI ready imap / smtp server.