I can never know for sure if email is avoiding the spam folder, but everything tells me if it does happen, it's quite rare now.
First, I will send emails to test accounts I have set up with major email providers (gmail, yahoo, outlook, etc). I used to do this often, but they have all been going to the inbox on my last few tests, so I haven't done this recently.
Second, is feedback I get from recipients. When I send an email and ask for a reply, I'll get a reply. I also used to hear a few times a month, "sorry for the delay. I found your email in my spam folder!". This has gone away.
First, I will send emails to test accounts I have set up with major email providers (gmail, yahoo, outlook, etc). I used to do this often, but they have all been going to the inbox on my last few tests, so I haven't done this recently.
Second, is feedback I get from recipients. When I send an email and ask for a reply, I'll get a reply. I also used to hear a few times a month, "sorry for the delay. I found your email in my spam folder!". This has gone away.