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It might have been legitimate, but messages like that are also commonly used in phishing scams, so the context matters.
Email providers occasionally send notices about security or settings changes, especially if they are retiring older connection methods such as basic authentication for POP, IMAP, or SMTP. In those cases they may tell users to update their mail app settings or enable modern authentication. However, legitimate notices usually do not pressure you to act immediately through a random link, and they normally direct you to sign in through the provider’s official website rather than through a link inside the email.
A common sign of a scam is an email that says your account will stop receiving messages unless you click a link and “update your settings,” especially if the link goes to a page asking for your email password. Attackers send these to steal login credentials. Other warning signs include a sender address that does not exactly match your email provider, generic greetings, spelling errors, or links that point to a domain unrelated to the provider.
If you still have the message, check the sender address and hover over any links (without clicking) to see the real destination. If the link is not clearly from your provider’s official domain, it is very likely phishing. The safest approach is to ignore the email and instead log in directly to your email provider by typing the official website into your browser. If there were a real settings change required, your account dashboard or notifications would normally mention it there.
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hth
Marcin