Service Manager

Technical and Operations Manager

Obaid ur Rehman

IT Professional

Albert Widjaja

<div>
This is looking good as long as your mailserver uses mail.caretakers.pk in its HELO/EHLO message when sending mail. 
 

<pre><code class="code-1 nolinks" id="code-20-42714042-1">~ $ dig +short MX caretakers.pk
5 mail.caretakers.pk.
~ $ dig +short mail.caretakers.pk
182.176.171.130
~ $ dig +short -x 182.176.171.130
mail.caretakers.pk.
</code></pre>
 
This does not help: 

<pre><code class="code-1 nolinks" id="code-20-42714042-2">~ $ telnet mail.caretakers.pk 25
Trying 182.176.171.130...
Connected to mail.caretakers.pk.
Escape character is '^]'.
220 srv.caretakers.pk ESMTP Postfix
QUIT
221 2.0.0 Bye
Connection closed by foreign host.
</code></pre>
As your server calls itself srv.caretakers.pk not mail.caretakers.pk...
</div>

The More I know, the more I don't know

David Johnson, CD

Fractional CTO

David Favor

<div>
All of the input from experts was helpful. So I waited for a day, tested again and now it is working like a charm!
</div>

<div>
<div class="content wysiwyg-content">
Hello everyone, 
 
After 02 months, my ISP finally helped me with Reverse DNS / PTR records. Now when I test my email server on MXToolBox, it states the following error on MXToolBox: 
 
1- Reverse DNS does not match SMTP Banner 
 
My email client is also not able to login to the IMAP. Previously, the email client could login to both IMAP/SMTP and only email was being rejected due to no PTR record. 
 
I believe the tech guys at ISP didn't enter it correctly. The domain is caretakers.pk 
 
Any help would be highly appreciated! 
 
Thanks and regards,
</div>
</div>

Hello everyone,

After 02 months, my ISP finally helped me with Reverse DNS / PTR records. Now when I test my email server on MXToolBox, it states the following error on MXToolBox:

1- Reverse DNS does not match SMTP Banner

My email client is also not able to login to the IMAP. Previously, the email client could login to both IMAP/SMTP and only email was being rejected due to no PTR record.

I believe the tech guys at ISP didn't enter it correctly. The domain is caretakers.pk

Any help would be highly appreciated!

Thanks and regards,

Reverse DNS does not match SMTP Banner

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

A web server refers to the software that helps to deliver web content that can be accessed either through the Internet or through an intranet. The primary function of a web server is to store, process and deliver web pages to clients. The communication between client and server takes place using the Hypertext Transfer Protocol (HTTP). The most common use of web servers is to host websites, but there are other uses such as gaming, data storage, running enterprise applications, handling email, FTP, etc.

Web Servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.