Hi, I am experiencing a similar issue with Office365. Any idea?
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Postie Configuration Test
Wordpress timezone: (0)
Current time: 2018-03-28 23:17:24
Current time (gmt): 2018-03-28 23:17:24
Postie time correction: 0
Post time: 2018-03-28 23:17:24
Encoding
default_charset: UTF-8
DB_CHARSET: utf8
DB_COLLATE: utf8_unicode_ci
WordPress encoding: UTF-8
Connect to Mail Host
Postie connection: sockets
Postie protocol: imap-ssl
Postie server: bettersoftwaresuggestions-com.mail.protection.outlook.com
Postie port: 993
Unable to connect. The server said: There was an error connecting to the server Connection timed out