Hi Red,
If no plugin works to send an email from your site, it’s clearly an issue with the host, especially since not even WP SMTP can fix it.
Just remembered that a friend was recently told by Dreamhost something that can be summarized like this: “the “FROM” email address used when sending mail with PHP needs to be a local address” – which is one of the highest levels of stupidity I can imagine (don’t know how Dreamhost expects other people outside your domain to contact you from your site).
Can you please check this email issue with them and try to see if they mention anything about what I just described?
Regards,
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Cosmin
Support Assistant