Confluence throws 'Error connecting to mail server: Command is not valid in this state' when connecting to Office 365

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Platform notice: Server and Data Center only. This article only applies to Atlassian products on the Server and Data Center platforms.

Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.

*Except Fisheye and Crucible

Problem

Confluence is unable to receive emails from Office 365 and throws the error 'Error connecting to mail server: Command is not valid in this state.'.

Cause

Confluence is not being able to connect to the mail server using a non-SSL connection. SSL is required by Office 365.

Resolution

To connect over SSL, select POPS in the 'Protocol' drop-down. Use the following configuration options for connecting to Office 365 for mail retrieval: 

Server NamePortRequires SSL (TLS)
outlook.office365.com995Yes

 

See POP and IMAP settings for Outlook Office 365 for business for additional details on the required POP/IMAP settings for Outlook Office 365. 

Last modified on Oct 4, 2016

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