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All you need to do is use the Basic Authentication option for Authentication. Now, there is an order of operations so you must first input the Hostname, input the Port Number, set the Protocol to your desired protocol, leave Authentication as "Select Type", leave Status as Disable, set Fetch Frequency/Emails Per Fetch/Fetched Emails to your liking, and Save Changes. Next you can set Authentication to Basic Authentication, click Config, input the Username, input the Password, and click Save. If the credentials work it’ll close the popup, if they don’t work it’ll produce an error. Once the popup closes successfully then you can set Status to Enable and click Save Changes. Once that’s set you’re good to go for the Remote Mailbox settings. For SMTP you’ll set Status to Enable, input the Hostname, input the Port Number, leave Authentication as Same as remote mailbox, and click Save Changes. Once all that’s done make sure you go to Admin Panel > Emails > Settings and set your outgoing email, alert email, enable mail fetching, etc.
Now to fetch mail you’ll need a cron job or scheduled task. You can read the docs here for examples:
When in doubt check your server documentation or guides online on how to create a working cron job for your specific setup.
Email Docs Reference:
Cheers.