Solved

Test if SMTP is blocked from Workstation to Internet

Posted on 2009-07-16
2
599 Views
Last Modified: 2013-11-16
We had an issue with a trojan/virus infected PC generating e-mail from it over our network.  Our IP as a result got blacklisted.  Since then we pulled the PC off the network, and believe the issue to be isolated.  As a precaution I blocked all outgoing SMTP traffic to the WAN except our e-mail server.  How can I test a workstation to make sure that SMTP is being successfully blocked?
0
Comment
Question by:fireguy1125
2 Comments
 
LVL 27

Accepted Solution

by:
shauncroucher earned 500 total points
ID: 24869776
telnet to a mail server outside your organisation.

Open command prompt

type:   telnet gmail-smtp-in.l.google.com 25


If this gives you 220 mx.google.com ESMTP 7si412080eyg.24 then 25 is NOT blocked.

It should say Connect Failed!

Shaun
0
 
LVL 1

Author Comment

by:fireguy1125
ID: 24869802
Ok, so I guess it is NOT blocked, as I am getting the reply.  I will have to check our firewall settings again.

Thank you.
0

Featured Post

The problems with reply email signatures

Do you wish that you could place an email signature under a reply? Well, unfortunately, you can't. That great Exchange/Office 365 signature you've created will just appear at the bottom of an email chain. What a pain! Is there really no way to solve this? Well, there might be...

Join & Write a Comment

Resolve DNS query failed errors for Exchange
Marketers need statistics and metrics like everybody else needs oxygen. In this article we explain how to enable marketing campaign statistics for Microsoft Exchange mail.
Familiarize people with the process of utilizing SQL Server views from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Access…
To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates…

706 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now