Link to O365 SMTP AUTH removal timeframe

Author: simonrob

README.md

@@ -10,7 +10,7 @@ The proxy works in the background with a menu bar/taskbar helper or as a headles
 
 ### Example use-cases<a id="example-use-cases"></a>
 - You need to use an Office 365 email account, but don't get on with Outlook.
-The email client you like doesn't support OAuth 2.0, which became mandatory [in January 2023](https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-deprecation-in-exchange-online-september/ba-p/3609437).
+The email client you like doesn't support OAuth 2.0, which became mandatory [in January 2023](https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-deprecation-in-exchange-online-september/ba-p/3609437) ([September 2025 for SMTP](https://techcommunity.microsoft.com/t5/exchange-team-blog/exchange-online-to-retire-basic-auth-for-client-submission-smtp/ba-p/4114750)).
 - You used to use Gmail via IMAP/POP/SMTP with your raw account credentials (i.e., your real password), but cannot do this now that Google has disabled this method, and don't want to use an [App Password](https://support.google.com/accounts/answer/185833) (or cannot enable this option).
 - You have an account already set up in an email client, and you need to switch it to OAuth 2.0 authentication.
 You can edit the server details, but the client forces you to delete and re-add the account to enable OAuth 2.0, and you don't want to do this.