Just in case someone need it, this config has worked from my end:
./bin/asadmin create-javamail-resource --mailhost smtp.office365.com --mailuser mail-address@mymail.org --fromaddress mail-address@mymail.org --property mail.smtp.auth=true:mail.smtp.password=mypassword:mail.smtp.port=587:mail.smtp.socketFactory.port=587:mail.smtp.socketFactory.fallback=true:mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory:mail.smtp.starttls.enable=true mail/notifyMailSession
Cheers
Usman