Basic Authentication will be turned off in Exchange Online.
Issue
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Microsoft is deprecating basic authentication in Office 365 (external link). Starting from 2022-11-01 tenants will be randomly selected and basic authentication will be disabled for the following email protocols (external link):
- POP
- IMAP
Environment
- Red Hat Enterprise Linux 9
- Red Hat Enterprise Linux 8
- Open Shift
- Microsoft Office 365
- postfix
- mail relay from postfix to Office 365
- fetchmail
- retrieving email from Office 365 via fetchmail
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