Only the admin user (or the user with the credentials in the alfresco-global.properties) can send an email notification.
Any other user Starting a workflow, can't send an email notification.
Error from the log:
ERROR [action.executer.MailActionExecuter] [mailAsyncAction2] Failed to send email to [djamel] : org.springframework.mail.MailSendException: Failed messages: com.sun.mail.smtp.SMTPSendFailedException: 554 5.7.8 User [admin@***********.com] not authorized to send on behalf of <ms.bara@*************.com>; message exceptions (1) are:Failed message 1: com.sun.mail.smtp.SMTPSendFailedException: 554 5.7.8 User [admin@********.com] not authorized to send on behalf of <ms.bara@***********.com>

