Subscribe confirmation mail goes to spam

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When someone subscribes to the blog, the confirmation mail goes to their spam. What can be done to prevent this?

I would try to use Mailgun. Never had any problem with that.

I’m using mailgun as well

I just tried signing up and the message came straight to my inbox, no spam!

It’s hard to control what happens after the email leaves your server. You’ll want to make sure that you’ve got the appropriate mx, spf, and dkim records on your domain, but it’s still a bit out of your control. If you’re self-hosting your email, you may find this helpful: How I finally got Google to accept my contact form mail (skip the part about email contact forms - the bottom bit has a bunch about what DNS settings are needed).