Jira and Confluence have started to use a new mail platform to deliver outgoing email.
This has been rolled out progressively to sites over the past few months, and will soon be complete. For administrators who whitelist IP ranges, you can update the list of IPs that Atlassian mail will be sent from as found on this page: Atlassian Cloud IP ranges and domains
Mail from Jira and Confluence will appear as being sent from the following addresses according to product & region. If you have automation rules that are triggered based on these emails, you may need to update your rules:
As an example, mail headers will look like the following:
Delivered-To: <recipient_email_address>
Received: by 2002:a50:a45b:0:0:0:0:0 with SMTP id v27csp4189711edb;
Mon, 28 Jan 2019 15:19:18 -0800 (PST)
X-Received: by 2002:a63:d40a:: with SMTP id a10mr21250376pgh.394.1548717558371;
Mon, 28 Jan 2019 15:19:18 -0800 (PST)
...
Return-Path: <bounce@mail-us.atlassian.net>
Received: from mta1e5-atlassian.mta.e.sparkpost.com (mta1e5-atlassian.mta.e.sparkpost.com. [35.167.7.36])
by mx.google.com with ESMTPS id v2si3018390plz.53.2019.01.28.15.19.18
for <recipient_email_address>
(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
Mon, 28 Jan 2019 15:19:18 -0800 (PST)
Received-SPF: pass (google.com: domain of bounce@mail-us.atlassian.net designates 35.167.7.36 as permitted sender) client-ip=35.167.7.36;
Received: from [104.192.138.232] ([104.192.138.232:51100] helo=3e4cbe63c6ad) by c.mta2vsmtp.cc.prd.sparkpost (envelope-from <bounce@mail-us.atlassian.net>) (ecelerity 4.2.40.67069 r(Core:4.2.40.16)) with ESMTPSA (cipher=ECDHE-RSA-AES256-SHA384) id C3/66-40788-6FD8F4C5; Mon, 28 Jan 2019 23:19:18 +0000
If you have further questions about the impact of this change to your site, feel free to add questions here in this public forum or contact our support team to discuss your specific site
This information has also been posted in our Cloud Changes Blog series which you can watch to get future release change information from once you are logged into confluence.atlassian.com