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I'm having similar problems, although part of it appears to be my DKIM settings in the domain being set following instructions from an email provider which then means Gmail is expecting encoded information in the header which I haven't yet figured out how to add to UNA email header- although if you have this issue you will be getting DMARC emails from gmail.
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Rowena I've just corrected Reverse DNS for your site it will probably help. However it's always better to install SMTP Mailer module and use external services to send mail from, it will guarantee that emails aren't going to spam folder.
Some recommended services are (some of them have generous free plan):
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I use https://www.mailjet.com/ It is very affordable and works great. None of my mail goes to spam.
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