Your email senders Exchange is old?

[Marauder2003]

If your senders are using an old Exchange server you may never hear from them again. MS will start blocking older Exchange servers.

https://techcommunity.microsoft.com/t5/exchange-team-blog/throttling-and-blocking-email-from-persistently-vulnerable/ba-p/3762078

[Cowboy T]

And that's why I don't depend on Microsoft. I stay with F/OSS for my email servers.

[Rickrock1]

I recently starting using proton mail after starting a thread here for email.

A few Gunners recommended Proton and it works perfect for me with some really great features.

LetsGoBrandon!

[MyOdessa]

I recently starting using proton mail after starting a thread here for email.

A few Gunners recommended Proton and it works perfect for me with some really great features.

LetsGoBrandon!

Proton is great, especially if all you need is a simple email account, but it also has limitations such as ability to set multiply categories in Proton's calendar and ability to use your own domain in email.

[skilletboy]

An alternative to Proton with slightly less features is GMX. I've had no complaints.