Solved

ISP blocking port 25 outgoing

Posted on 2004-04-16
4
880 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
ID: 10845305
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
ID: 10845385
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
ID: 10847183
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
ID: 10847469
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

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Question has a verified solution.

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

Downtime reduced, data recovered by utilizing an Experts Exchange Business Account Challenge The United States Marine Corps employs more than 200,000 active-duty Marines with operations in four continents, all requiring complex networking system…
We recently endured a series of broadcast storms that caused our ISP to shut us down for brief periods of time. After going through a multitude of tests, we determined that the issue was related to Intel NIC drivers on some new HP desktop computers …
A short film showing how OnPage and Connectwise integration works.
A simple description of email encryption using a secure portal service. This is one of the choices offered by The Email Laundry for email encryption. The other choices are pdf encryption which creates an encrypted pdf of your email and any attachmen…

911 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

22 Experts available now in Live!

Get 1:1 Help Now