Google doesnt have a very restrictive spam filter so you can try sending emails to a Gmail account. If your emails are being picked up as spam by Gmail it would suggest a server issue on your end. Here are a few things you could try:
- Change the content of the confirmation emails
- Try a different web hosting provider (your IP range could be in trouble)
- Make SURE reverse DNS is on your server. Without reverse DNS, most spam filters will trigger.

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