Issue Summary

Some new updates at Atlassian Email end causing outgoing notifications to be sent from jira@mail-us.atlassian.net on behalf of jira@<sitename>.atlassian.net
This is happening only for the projects where the default outgoing email address is used to send the notification.

Steps to Reproduce

1. Make sure that the notification address is selected as jira@<sitename>.atlassian.net in Project Settings > Notifications 
2. Trigger a notification from a ticket

Expected Results

The email is sent from jira@<sitename>.atlassian.net

Actual Results

The email is sent from jira@mail-us.atlassian.net on behalf of jira@<sitename>.atlassian.net

Workaround

• Use a custom email address to send the notifications as suggested here: steps for setting up custom email addresses.