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Sounds like your sendmail function is missing. Let’s try this. SSH into your server and trying sending and email using the following code. Don’t forget to replace 'user@domain.com with a valid email.
sendmail user@domain.com Body of Test Message
Also, how did you installed wordpress, as a One-Click install or manually?
This comment has been deleted
Hello all,
What I could suggest here is using an SMTP plugin for your WordPress site.
That way you will be able to specify an SMTP server with authentication which your emails would be going through. You could for example use Gmail’s SMTP settings. This would drastically increase the delivery rate of your emails as well compared to using plain PHP mail.
I’ve been using this plugin for a while now and it works very well: Easy WP SMTP
Hope that this helps! Regards, Alex