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Mail server - Use Office 365 Direct Send config


Up until now, my company was using one of our Office365 account as config for the atlassian mail server functionality (also in other Atlassian products).

Because of the extreme amount of e-mails now located in the "Sent" folder of this e-mail (mine), I am trying to use another way. For now, we don't want to buy a license just to use as a dummy sending e-mail.

I've found this documentation for Office 365. The Option 2 seems intersting to indeed avoid paying for a dummy mailbox.

I've changed my TXT DNS as advised, using Bitbucket's server IP and I've configured Bitbucket as such :


I've tried with and without the username set to equal the "Email from" field, but it doesn't work.

In the logs, it says : Connection refused (Connection refused). Failed messages: com.sun.mail.util.MailConnectException: Couldn't connect to host, port:, 25; timeout 30000;

I've checked with a DNS tool to be sure the DNS config was propagated. Of course, my config is not using domain-com, but a real one.

So, is this method supported by atlassian products ? If not, could it be, so we can use any email we want without having actually to create it as a mailbox and pay for the license ?

1 answer

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1 vote
Answer accepted


This should definitely work, because it's essentially unauthenticated SMTP. Based on the error, it could be caused by a firewall issue, maybe one that prevents outbound connections from your Bitbucket Server instance.

A simple test to confirm would be running something like telnet 25 to see if you're able to establish a connection or not.



Premier Support Engineer


In the end, I did not use this method for the e-mail sending, but I think you are right and I forgot to check in some firewall settings somewhere.

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