554 Message not allowed – Headers are not RFC compliant
Wordpress 4.9.7 Buddypress 3.1.0
I am using WP SMTP integrated with SendGrid to send out the automated emails that BuddyPress sends to members as the members interact with my wordpress site (i.e. someone commenting, sending a PM, favoriting, etc.)
When those emails get sent out to yahoo and aol addresses I get an email that says:
This is the mail system at host gateway36.websitewelcome.com.
I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<firstname.lastname@example.org>: host mx-aol.mail.gm0.yahoodns.net[220.127.116.11] said: 554
Message not allowed – Headers are not RFC compliant (in reply to end
of DATA command)
Reporting-MTA: dns; gateway36.websitewelcome.com
X-Postfix-Sender: rfc822; email@example.com
Arrival-Date: Mon, 9 Jul 2018 20:33:42 -0500 (CDT)
Final-Recipient: rfc822; firstname.lastname@example.org
Remote-MTA: dns; mx-aol.mail.gm0.yahoodns.net
Diagnostic-Code: smtp; 554 Message not allowed – Headers are not RFC
I also see that the emails are sending duplicate subject lines which I read could be the root of this issue.
1. Does anyone have a solution for this?
2. If the solution is making sure there is only one subject line, does anyone know how to execute this?
Thanks for your time guys 🙂
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