Solved

ISP blocking port 25 outgoing

Posted on 2004-04-16
4
878 Views
Last Modified: 2010-03-18
My Isp has just started blocking outgoing port 25. I run a small home businness and once a month we send out about 2000 email invoices. I have a colo box that i was connecting to , to send these emails. My ISP also shutsdown its smtp server after i send about 10 emails in arow. I called them and they have acknoloeged  the fact that they block the outgoing.

I can change the port on my smtp server to listen on another port, but my billing program does not allow modifing the port.

So does anyone know how i can do some kind of port forwarding?
if i had a local linux box , i could probably do something.
My router does port forwarding, but only coming in

Any suggestions?

thanks
0
Comment
Question by:paries
  • 2
4 Comments
 
LVL 51

Accepted Solution

by:
Netman66 earned 500 total points
Comment Utility
I'd say you have a business case for what you are doing - why don't you talk with the ISP and arrange something with them that will work.  Perhaps they would be willing to put your server in an exemption list.

I suppose they are trying to either cut down on spam or blocking potential virus activity.

0
 

Author Comment

by:paries
Comment Utility
yeah , thier business case it to upgrade to a business cable modem. You get the same speed , the same crappy uptime and all u get is a static ip and unblocked port 25. I do not think that is worth an extra $100/month
0
 
LVL 51

Expert Comment

by:Netman66
Comment Utility
Ahh...I didn't realize you were on residential.  You mention a colocated server - what about generating from there?

0
 
LVL 7

Expert Comment

by:IceRaven
Comment Utility
Sorry took me a long time to find a solution for you... that and I had to go to sleep :)

Download and use this tool.

http://www.dlcsistemas.com/html/relay_tcp.html

What you do is redirect your local port 25, to your remote smtp server port ?? (Whatever you set it as).  I have just tested it, my ISP also blocks SMTP.

Command looks something like this:

tcprelay 25 mail.myserver.com 2055

Cheers,
IceRaven
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Join & Write a Comment

Enterprise networks where VoIP phones have been deployed frequently use port configurations that allow both a computer and an IP phone to be plugged into the same switch port but use different VLANs. On Cisco equipment I'm referring to the "native V…
Are you one of those front-line IT Service Desk staff fielding calls, replying to emails, all-the-while working to resolve end-user technological nightmares? I am! That's why I have put together this brief overview of tools and techniques I use in o…
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.
This video explains how to create simple products associated to Magento configurable product and offers fast way of their generation with Store Manager for Magento tool.

762 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

6 Experts available now in Live!

Get 1:1 Help Now