Question Is multiple HELO registration possible?

[emrekoc]

Server operating system version

Centos 7

Plesk version and microupdate number

18.0.63

Hello, I have 2 domains on a single server, they have their own PTR and IP records, but mail.firstdomain.com is my hostname, seconddomain.com is a standard domain, what I want to ask here is that I want the domains to use their own mail server addresses in SMTP greeting (HELO), is this possible on a single server?

They have asked this question before, I apologize for that, but I couldn't reach a conclusion, I want to know, can I make this request?

The following Gmail output is added to show that mail.firstdomain.com is used as helo in emails sent from seconddomain.com.

Authentication-Results: mx.google.com;
       dkim=pass header.i=@seconddomain.com header.s=default header.b=HGggjp6b;
       spf=pass (google.com: domain of secondmail@seconddomain.com designates 185.223.77.86 as permitted sender) smtp.mailfrom=secondmail@seconddomain.com;
       dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=seconddomain.com
Received: from mail.firstdomain.com (localhost.localdomain [127.0.0.1]) by mail.firstdomain.com (Postfix) with ESMTP id 469293062B21 for <test_mail_gmail@gmail.com>; Tue, 18 Feb 2025 17:25:19 +0300 (+03)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=seconddomain.com; s=default; t=1739888720; bh=g3zLYH4xKxcPrHOD18z9YfpQcnk/GaJedfustWU5uGs=; h=Received:Received:From:To:Subject; b=HGggjp6bS22htF7YEIb4o6UYhuTzFtDgGXBLIb6HNqN2ZOx5Molz7nBeasWvnvSCR
     tbIPiDZ8THvrlbOc7w3h8E7CGkJrtYMqYLgJjghqkaBOZFGw08mIXKscOfHhq/ZeSx
     rwqoZBwNnXj/qmaGpFAgFB83XTJUet7zAEi78TyY=
Authentication-Results: mail.firstdomain.com;
        spf=pass (sender IP is 127.0.0.1) smtp.mailfrom=secondmail@seconddomain.com smtp.helo=mail.firstdomain.com
Received-SPF: pass (mail.firstdomain.com: localhost is always allowed.) client-ip=127.0.0.1; envelope-from=secondmail@seconddomain.com; helo=mail.firstdomain.com;
X-Spam-Flag: NO
X-Spam-Score: -3.001
X-Spam-Level:
X-Spam-Status: No, score=-3.001 tagged_above=-9999 required=3 tests=[ALL_TRUSTED=-1, BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: mail.firstdomain.com (amavisd-new); dkim=pass (1024-bit key) header.d=seconddomain.com
Received: from mail.firstdomain.com ([127.0.0.1]) by mail.firstdomain.com (mail.firstdomain.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BHxHvHyWQxcK for <test_mail_gmail@gmail.com>; Tue, 18 Feb 2025 17:25:18 +0300 (+03)
Received: from webmail.seconddomain.com (localhost.localdomain [IPv6:::1]) by mail.firstdomain.com (Postfix) with ESMTPSA id 2D8F03062B20 for <test_mail_gmail@gmail.com>; Tue, 18 Feb 2025 17:25:16 +0300 (+03)
Received-SPF: pass (mail.firstdomain.com: connection is authenticated)
MIME-Version: 1.0
Date: Tue, 18 Feb 2025 17:25:15 +0300
From: secondmail@seconddomain.com
To: test_mail_gmail@gmail.com
Subject: test
User-Agent: Roundcube Webmail/1.4.15
Message-ID: <6dc91debfb1047067b74e544992d6b2e@seconddomain.com>
X-Sender: secondmail@seconddomain.com
Content-Type: text/plain; charset=US-ASCII; format=flowed
Content-Transfer-Encoding: 7bit
X-PPP-Message-ID: <173988871756.27801.443459879870409809@mail.firstdomain.com>
X-PPP-Vhost: seconddomain.com

 

[Sebahat.hadzhi]

You can do it by manually editing the Postfix config. Here's the article guide on the matter:

https://support.plesk.com/hc/en-us/articles/12387713955223-Is-it-possible-to-have-different-SMTP-banners-for-different-IP-addresses-on-the-Plesk-server

I hope that helps.

 

[emrekoc]

Thank you for your answer (@Sebahat.hadzhi), but I think the system I want is not a very accepted structure, so I will solve the problem this way after installing it on a virtual server and defining the ip to it. It's hard for me not to be able to use just plexiglass, but I think I'll set up another simple panel and use it.