Solved

ISP blocking port 25 outgoing

Posted on 2004-04-16
4
882 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

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Sonicwall AP 3 62
FTP output from Wireshak 6 89
VMware ESXi network trunking best practice scenario for iSCSI & NAS ? 8 167
OpenVPN Speed limitation to only 10 mbps 7 137
Sometimes you might need to configure routing based not only on destination IP address, but also on a combination of destination IP address (or hostname) and destination port number. I will describe a method how to accomplish this with free tools. …
Have you ever set up your wireless router at home or in the office to find that you little pop-up bubble in the bottom right-hand corner of Windows read "IP Conflict - One of more computers on the network have been assigned the following IP address"…
Along with being a a promotional video for my three-day Annielytics Dashboard Seminor, this Micro Tutorial is an intro to Google Analytics API data.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

773 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