How to test Oubound routing through Email Security.cloud services

Products

• Email Security.cloud

Issue/Introduction

This Article describes the proper steps in order to validate the correct routing of the outbound mail traffic through our Email Security.cloud services

Environment

Email Security.cloud

Cause

This outbound testing step is necessarily when your mail server is not able to reach our Email security infrastructure.

Resolution

In order to ensure that you are allowing the routing of your mail traffic properly via our Email service Infrastructure, We recommend to follow the below steps using Telnet client.

1 - Type the following command using the outbound mail route provided:

Telnet clusterxout.xx.messagelabs.com 25 

If the connection is accepted, the remote server responds:   

Trying 195.245.230.67... (remote server IP)
Connected to clusterx.xx.messagelabs.com.
Escape character is '^'’.
220 server-4.tower-50.messagelabs.com ESMTP

Note:  (The "X" for clusterx is a placeholder. This will be the cluster number your account is on, and dependent upon country if EU or US. Contact Tech Support if this information is needed.)

2 - Type a valid helo command (helo and a word of more than five characters):

helo mail.customer.com

The remote server responds that the SMTP conversation has started:

250 server-4.tower-50.messagelabs.com

3 - Type in a valid email address at your domain:

mail from: [email protected]

The remote server responds:
250 OK

4 - Type an external email address here:

rcpt to: [email protected]
250 OK

5 - Then type: data

This instruction tells the remote server that data is due to be received. The remote server responds:

354 go ahead

6 - Type the subject and body of the email. Email Services must have an email with a body or it gives a 550 error:

subject: testing testing testing

To finish, enter:
. ↵ . ↵ (period, return, period, return)
The remote server responds:
250 ok 1176493466 qp 7506 server-4.tower-50.messagelabs.com!1176493400!6015990!1

Note: This 250 OK message means that an email has been successfully transferred from the sending mail server to the recipient mail server.

7 - Type the quit command to close the connection: quit

The remote server responds:
221 server-4.tower-50.messagelabs.com
Connection closed by foreign host