Most ISPs have an email configuration page with detailed information about the settings.
- https://www.att.com/support/article/...ort/KM1010523/
- https://www.xfinity.com/support/arti...-xfinity-email
- https://www.cox.com/residential/supp...-settings.html
- https://www.spectrum.net/support/int...oubleshooting/
- https://frontier.com/helpcenter/cate...erver-settings
As you can see if you scan all those links, they are all very, very, very, similar. There are standards. Most ISPs follow those standards.
Of course, gmail follows only the standards they like, but often not all of them.
There are many reasons NOT to use ISP-based email, but to use some other cloudy provider instead. The main reason is that you can change ISPs, but not have to change email addresses on hundreds of accounts. Just be certain to pick your email provider carefully.
OTOH, I have trust issues, so I run my own email server. Almost nobody should do that. Running email servers isn't for hobbyists. Also, using free email services means that your data is being sold - they have to pay their bills somehow. I wouldn't doubt that ISPs are doing this too.
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