Did you ever receive complaints that your emails are ending up in spam folder for Gmail/Outlook/<other big email provider>?
How about you receiving a lot of spam emails?
How about you receiving a lot of spam emails?
I do get a lot of incoming spam though, but I think that's more to do with some of my email addresses being over 20 years old.
I'm getting about 1-2 spam mails a month delivered to my inbox, usually french SEO spam. Not worth investigating.