Ubuntu 16.04.3 here.

I can confirm this issue with Amazon WorkMail. I ran Evolution with EWS_DEBUG=2 and dumped out the transaction between the client and AWS. The transaction itself is successful. However, if you un-MIME the actual message being sent, you will notice in the headers:

From:

(Literally, the from field is blank.)

I wiped my Evolution configuration and started from scratch and yielded the same result. I also have an EWS account configured with Exchange 2013 and have been using it successfully. 

I have attached three files that demonstrate the situation:

debug.log - The dump of the interchange between AWS and Evolution
soap_post.xml - The prettied up version of the POST sent to AWS containing the message payload
mime_decode.txt - The decoded message as contained within the MimeContent field in the XML

I am happy to provide more information; let me know what is needed. 


seliger@core:~$ dpkg -l | grep evolution
ii  evolution                                   3.18.5.2-0ubuntu3.2                          amd64        groupware suite with mail client and organizer
ii  evolution-common                            3.18.5.2-0ubuntu3.2                          all          architecture independent files for Evolution
ii  evolution-data-server                       3.18.5-1ubuntu1                              amd64        evolution database backend server
ii  evolution-data-server-common                3.18.5-1ubuntu1                              all          architecture independent files for Evolution Data Server
ii  evolution-data-server-online-accounts       3.18.5-1ubuntu1                              amd64        evolution data server integration with Ubuntu Online Accounts
ii  evolution-ews                               3.18.5-1ubuntu1                              amd64        Exchange Web Services integration for Evolution
ii  evolution-plugins                           3.18.5.2-0ubuntu3.2                          amd64        standard plugins for Evolution
ii  libebackend-1.2-10:amd64                    3.18.5-1ubuntu1                              amd64        Utility library for evolution data servers
ii  libebook-1.2-16:amd64                       3.18.5-1ubuntu1                              amd64        Client library for evolution address books
ii  libebook-contacts-1.2-2:amd64               3.18.5-1ubuntu1                              amd64        Client library for evolution contacts books
ii  libecal-1.2-19:amd64                        3.18.5-1ubuntu1                              amd64        Client library for evolution calendars
ii  libedata-book-1.2-25:amd64                  3.18.5-1ubuntu1                              amd64        Backend library for evolution address books
ii  libedata-cal-1.2-28:amd64                   3.18.5-1ubuntu1                              amd64        Backend library for evolution calendars
ii  libedataserver-1.2-21:amd64                 3.18.5-1ubuntu1                              amd64        Utility library for evolution data servers
ii  libedataserverui-1.2-1:amd64                3.18.5-1ubuntu1                              amd64        Utility library for evolution data servers
ii  libevolution                                3.18.5.2-0ubuntu3.2                          amd64        evolution libraries