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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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We use MailJet as well. Works great for us
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Comment to 'How to stop my UNA site sending confirmation emails to SPAM box ? '
