If you need to read through a lot of email addresses, try Thunderbird. I’ve had over ten addresses in it, and it works pretty well. It also has an RSS reader that I rarely use, but it’s there. It’s my preferred client, and after a lot of use, I finally donated to the project. https://donate.mozilla.org/en-US/thunderbird/
My hard drive is failing, and I’m about to replace it. That means it’s time to check the backups, to make sure they are functional. This short article describes my home backup system. You might find this useful for setting up your own backups.