SMTP error from remote mail server after pipelined mail error

Fresh Studio

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Jan 16, 2019
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Hi,

(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.

Code:
2019-01-16 22:45:26 1gjt02-0003mM-D1 Sender identification U=domain D=domain.com [email protected]
2019-01-16 22:45:26 1gjt02-0003mM-D1 SMTP connection outbound 1547675126 1gjt02-0003mM-D1 domain.com [email protected]
2019-01-16 22:45:27 1gjt02-0003mM-D1 ** [email protected] R=dkim_lookuphost T=dkim_remote_smtp H=smtp.recipient-server-domain.com [198.46.81.29] 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 4.1.1.1)
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.