Validation emails are going to spam because our domain name is so new. What's the best way to get the message to users that they need to check their spam folders?

I'm an admin on lemmy.ninja, a month-old Lemmy instance. Users are required to validate their emails, but the email sent to them to do this always ends up in the spam folder. There's nothing we can do about that. We've found, however, that if the users are told to go get it, they can find the mail and validate just fine.

What's the best way to get this message to users while they're creating their new account? Is there a file we can edit to add instructions about checking their spam folder while they're creating the "create" button?

I'm hoping someone has a creative solution. I know it won't be a 100% fix, but any little bit helps.