When I try to send emails to one of my clients email address, I am getting below error on my webmail. Any idea why is that happening?
X=TLSv1.2:ECDHE-RSA-AES256-GCM-SHA344:256 CV=no: SMTP error from remote mail server after RCPT TO:<firstname.lastname@example.org>: 550-SPF: x.x.x.x is not allowed to send mail from\n550 bbbb.com
Discussions related with hosting control panels used, which include cPanel, Plesk, Directadmin etc..
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