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I would like to receive notifications when visitors fill out a WPForm, but I don’t want to purchase a domain email or grant access to an SMTP plugin to control an email account I already have. Is there a way to achieve this, either through email or text notifications?
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You can but deliverability will be iffy. Lot’s of mail will likely go into receivers’ SPAM folder.
By default, WP will use PHP’s Mail function, on a production environment, I’d set up an SMTP account or some transactional email service.
Yes this is fine. You just need to ensure your SPF and DMARC records are set up. Those are what ensure deliverability. **However** I wouldn’t recommend doing this if you’re using shared hosting – those ip addresses are almost always blacklisted.