550 Callback setup failed while verifying
Problem reported by Nick Tsif - 11/1/2019 at 1:10 AM
Dear Sirs

I receive this error , please i need you help

Remote Server returned: 550 Callback setup failed while verifying (result of an earlier callout reused). The initial connection, or a HELO or MAIL FROM:<> command was rejected. Refusing MAIL FROM:<> does not help fight spam, disregards RFC requirements, and stops you from receiving standard bounce messages. This host does not accept mail from domains whose servers refuse bounces. Sender verify failed 

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Nick Tsif Replied
these are the header of the email (notice the email has change due to privacy)

Return-Path: <tp@000.gr>
Received: from TheodosiaPC (UnknownHost []) by mail.000.gr with SMTP;
   Wed, 30 Oct 2019 11:49:11 +0200
Return-Receipt-To: <tp@000.gr>
From: <tp@000.gr>
To: <111@111.11>
Subject: =?iso-8859-7?B?xOnq4env6+/j5/Tp6twg4+nhIPTv7SDB7eHw9PXu6eHq/CDt/Ozv?=
Date: Wed, 30 Oct 2019 11:50:32 +0200
MIME-Version: 1.0
Content-Type: multipart/alternative;
X-Priority: 1 (Highest)
X-MSMail-Priority: High
X-Mailer: Microsoft Outlook 16.0
Thread-Index: AdWPBeaRoHx73DbHQ5uOoIxzJEQ4agAAYYjQ
Content-Language: el
Importance: High
Disposition-Notification-To: <tp@000.gr>

This is a multipart message in MIME format.

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