I just started having this same issue as well. Has anyone been able to solve it? I have the from email using @mydomain.com as the email address and other sites on the same server are working fine. Deactivated all plugins as well.
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I just started having this same issue as well. Has anyone been able to solve it? I have the from email using @mydomain.com as the email address and other sites on the same server are working fine. Deactivated all plugins as well.