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Wordpress not sending emails on a certain site (Apache Virtual Hosts) Ubuntu 16.04
I have three Wordpress sites on this droplet. The first two send emails fine. The third one, which I have set up recently, will not send emails - not from contact us forms, nor from trying to change the admin email. The forms etc appear to work fine but no email ever shows up.
I am using Migadu. Sending emails manually from this domain is fine. So I don’t think it’s the DNS.
Nothing shows up in /var/log/mail.log. In fact this file has not been edited since 2018. Same for mail.log.1
I tried using WP Mail SMTP plugin and pointing it at Migadu SMTP. This doesn’t work, it says “There was a problem while sending the test email” when testing.
I never had this problem when I set up the second Virtual Host site. What could be causing this?