Also I have seen some messages saying that along with deprecation of the password only basic authentication login being done, that POP and IMAP access will be deprecated as well, and
believe is incorrect, especially for IMAP which is the protocol used by gmail and that would
essentially crash email service for most of the world which seems an unlikely plan. I do also
hope the only thing being deprecated is the basic authentication password only login like
has been used for decades especially for old hotmail accounts, many of which are also POP
or using IMAP. So far, what I have observed is that the basic authentication password only
login is what is being deprecated and the login requirement is being updated to OAuth2.
However, legacy servers that work fine for the legacy basic authentication login using only
a password will not also accept a login change from the client app simply being changed to
the modern authentication OAuth2 because that would be too easy. A different server for
incoming mail must also be selected which will accept an updated login selection OAuth2
that is made in the mail client app. An example I observed applicable earlier this morning
I can describe is a legacy mail server for old hotmail accounts pop3.live.com / port 995
that still accepts basic authentication password only login for a POP account, yet rejects
a user selected update to login using modern authentication OAuth2, even when all app
permissions are correct and this should work okay. But it doesn't work and neither are
error popups triggered, but what happens instead is a misleading "no new messages"
server response when in actuality there is a bin full of waiting messages it doesn't report.
The problem is only resolved by changing from the legacy server pop3.live.com to use a
different server that does accept the updated login using modern authentication OAuth2.
The server I discovered does work is a newer different mail server outlook.office365.com
which does respond normally and display waiting messages working as it should. From
this observation it appears the requirement is to use the updated login OAuth2 in
combination with the correct port for POP / 995 or for IMAP / 993 in combination
with the mail server address that will respond normally to that updated OAuth2 login.
All the app permissions also have to be checked in the settings of the Outlook account
and what is actually just a new name for your old hotmail account, with those settings
accessed in the webmail portal for your Outlook account. Linked below is a page
that gives the full bill of particulars in drop down instructions for each parameter of
various settings.
https://support.microsoft.com/en-us/office/pop-imap-and-smtp-settings-for-outlook-com-d088b986-291d-42b8-9564-9c414e2aa040