- multi tenant installation
- tenant named "tenant"
- user "user" in "tenant" (user@tenant) with email "firstname.lastname@example.org"
- login as admin@tenant
- start workflow assigned to "user", enable sending of notification
- notification email is send to email@example.com
- the email is send to user@tenant instead of firstname.lastname@example.org
com.sun.mail.smtp.SMTPAddressFailedException: 504 5.5.2 <user@tenant>: Recipient address rejected: need fully-qualified address