![]() Usually there are one or two replies where people share virtually no helpful information. Most online discussions about how to set up port 465 or port 587 on a server begin with a system admin asking on a forum how to do this. The Email Service Must Activate the Appropriate Service and Ports You should start with NONE after setting up everything and then work your way down the list.ĪUTHENTICATION METHOD has five options at the present time: NO AUTHENTICATION PASSWORD, TRANSMITTED INSECURELY ENCRYPTED PASSWORD KERBEROS / GSSAPI and NTLM. Users don’t need to know what these protocols do. But these last two options are decided upon by the email service provider.ĬONNECTION SECURITY has three options at the present time: NONE, STARTTLS, and SSL/TLS. The user may also have to change the AUTHENTICATION METHOD and CONNECTION SECURITY method. What needs to be changed for sure is the PORT NUMBER. There should be instructions for doing so in their HELP features or email software vendor’s online documentation. The user has to learn how to change the Outgoing SMTP Server port number in their email software. These measures do not reduce email spam - they just make it harder for email spammers to compromise a corporate email server and thus they are more likely to go elsewhere for the resources they need. Over the years ISPs have been encouraging companies to move their VPN users to Port 587 or Port 465, both of which have security features that can help fight email spammers. But if you are using Residential Internet Access services your access to port 25 will most likely be blocked. If you go to any business that offers free WiFi they will almost universally allow you to send email to port 25 on any email server. But if you use email through another service (such as a corporate Virtual Private Network, or VPN) then your email client will default to port 25. If you sign up with an Internet access provider like Comcast or AT&T they will assign you an email address and you can use their email service. So gradually major American Internet Access Providers began blocking their customers’ ability to send email through port 25. The server was always “listening” on port 25.Īs email spammers became more sophisticated they developed tools to exploit the lack of security features associated with “Port 25”. The client would contact the server on the server’s “Port 25” and start sending information. Years ago when email was first designed the technical specifications called for the client program (your email reader) and the client program (your email service) to use “Port 25” whenever the client wanted to send email. ![]() The Problem: American Internet Access Providers Fighting Email Spammers ![]() We have had to decipher the Orangutanese of the Linux Administration world and we feel it will be helpful to walk you through the basics without all the cryptic nonsense. Many Postfix email service users have struggled to change their SMTP ports because the documentation was written by drunk orangutans who don’t understand how to communicate in plain, every day English. Given how it is impossible to find good, human-comprehensible information on the problem and how to resolve it, we thought we would share our experiences. We just went through this excruciating learning experience on behalf of one of our users. Welcome to Communizine! Today is May 2nd, 2023
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