Message could not be delivered to some YAHOO.COM recipients.

Someone knows how to fix this problem?
Also I did not find anywhere the option to change the website email nor any email settings to configure,

 

MailEnable: Message could not be delivered to some recipients.

The following recipient(s) could not be reached:

 

      Recipient: [SMTP:avelivillarreal@yahoo.com]

      Reason: 554 Message not allowed - Headers are not RFC compliant[291]

 

 

Message contents follow:

 

Received: from DAPROSE-WEBSRVR.daprose.com ([127.0.0.1]) by daprose.net with MailEnable ESMTP; Wed, 1 Nov 2017 05:25:47 -0500

Subject: Cuenta de usuario creada

X-PHP-Originating-Script: 0:Sendmail.php

Date: Wed, 01 Nov 2017 05:25:46 -0500

From: soporte@inaaeb.club

To: avelivillarreal@yahoo.com

Subject: Cuenta de usuario creada

Content-Type: text/plain;

 charset="UTF-8";

 format="flowed"

MIME-Version: 1.0

Content-Transfer-Encoding: 8bit

Message-ID: </.entity.584.1509531946.6798@inaaeb.club>

  • Yahoo servers are rejecting email from your domain SMTP server. This can be caused by several reasons including the ones below:

    • If there are no Message-ID or Date headers in the messages being sent by your program
    • If the attachments do not follow the exact structure for that file type, these are also considered suspicious and hence quarantined, just in case they pose any form of threat.
    • If the message has 2 subjects the mail can be rejected.

    Source

    Based on my research, Yahoo commonly does this if there are two Subject: entries in the header.

  • @inaaeb Which version of Elgg are you using? If not Elgg 2.3.4, could you upgrade and test again?