Solved

Test if SMTP is blocked from Workstation to Internet

Posted on 2009-07-16
2
602 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

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Granting full access permission allows users to access mailboxes present in their database. By giving full access permission one can open and read the content of any mailbox but cannot send emails from that mailbox.
Resolve Outlook connectivity issues after moving mailbox to new Exchange 2016 server
In this video we show how to create an email address policy 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 Mail Flow…
The basic steps you have just learned will be implemented in this video. The basic steps are shown to configure an Exchange DAG in a live working Exchange Server Environment and manage the same (Exchange Server 2010 Software is used in a Windows Ser…

809 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