SMTP error from remote mail server after pipelined mail error

Fresh Studio

Jan 16, 2019
cPanel Access Level
Root Administrator

(I've exemplified the domain name).

I've configured the domain in object as a "LOCAL MAIL EXCHANGER" in my DNS Zone Editor, also disable RFC mandatory compliance in ACL section of Exim Service configuration, and created the sender account on the domain as [email protected], but when, using WordPress with Contact 7 (of course configure to send from [email protected]) , I send a mail, I can see from Exim log that it's being sent from [email protected], so the SMTP recipient server obviously returns a 550 Access Denied error.

2019-01-16 22:45:26 1gjt02-0003mM-D1 Sender identification U=domain [email protected]
2019-01-16 22:45:26 1gjt02-0003mM-D1 SMTP connection outbound 1547675126 1gjt02-0003mM-D1 [email protected]
2019-01-16 22:45:27 1gjt02-0003mM-D1 ** [email protected] R=dkim_lookuphost T=dkim_remote_smtp [] X=TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=yes: SMTP error from remote mail server after pipelined MAIL FROM:<[email protected]> SIZE=1765: 550 Access denied - Invalid HELO name (See RFC2821
2019-01-16 22:45:27 cwd=/var/spool/exim 7 args: /usr/sbin/exim -t -oem -oi -f <> -E1gjt02-0003mM-D1
2019-01-16 22:45:27 1gjt03-0003mT-Jo <= <> R=1gjt02-0003mM-D1 U=mailnull P=local S=2242 T="Mail delivery failed: returning message to sender" for [email protected]
2019-01-16 22:45:27 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1gjt03-0003mT-Jo
2019-01-16 22:45:27 1gjt03-0003mT-Jo Sender identification U=mailnull D=-system- S=mailnull
2019-01-16 22:45:27 1gjt02-0003mM-D1 Completed
Any help? Thanks.