<div>
Hi,<br />
<br />
The best way (IMO) to test email is to use telnet/netcat<br />
<br />
nc &lt;recieving host&gt; 25<br />
<br />
Does that work?<br />
<br />
Can you resolve the host? (host &lt;hostname&gt;)<br />
<br />

</div>


Hi,

The best way (IMO) to test email is to use telnet/netcat

nc <recieving host> 25

Does that work?

Can you resolve the host? (host <hostname>)



<div>
netcat worked and I can resolve the host
</div>


<div>
<div class="content wysiwyg-content">
Can someone tell me what this error is and how to troubleshoot:<br />
<br />
== user@domain.com R=send_to_smart_host T=remote_smtp defer (-53): retry time not reached for any host<br />
<br />
Thank you!
</div>
</div>


Can someone tell me what this error is and how to troubleshoot:

== user@domain.com R=send_to_smart_host T=remote_smtp defer (-53): retry time not reached for any host

Thank you!

Problem Sending Email with exim

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

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.