evolution-ews changes the from field to invalid@invalid

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 ...

Status changed to 'Confirmed' because the bug affects multiple users.

The error looks like https://bugzilla.gnome.org/show_bug.cgi?id=770754 which should be fixed on newer versions, can you try on Ubuntu 18.04 if that's still a problem?