Maxprog Support

Question: Hello, does eMail Verifier need port 25 or an SMTP relay to work or how does this aspect of setting up the software work?

Thank you.

Answer: Yes, eMail Verifier needs port 25.

Port 25 blocking fully prevents email validation to be possible actually!

eMail Verifier requires full access to port 25 in order to work. eMail Verifier needs to connect to each address relay server. Relay servers only work on port 25.

Port 25 is a network connection channel. Some Internet Service Providers (ISP) intercept port 25 so it is not possible to use eMail Verifier nor any software using port 25.

When you run eMail Verifier on your computer, it always uses port 25 to connect to remote email relay servers. Therefore, if your ISP is blocking the port, eMail Verifier will be unable to fully test e-mail addresses, eMail Verifier can check the syntax of the e-mail addresses and whether the domain they belong to exists but the last step, connecting to the address MX Exchanger, can't be performed.

Unfortunately, there is nothing we can do to change this. Port 25 is the standard for sending messages and the one eMail Verifier uses. The only solutions are either to contact your ISP and see if they can remove that block or switch to another ISP. Smaller local ISP's usually do not block Port 25.

You can easily check whether you are affected by port blocking using Telnet. It is explained here: How to find out whether port 25 is blocked by my ISP?