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eMail Verifier | Frequently Asked Questions

eMail Verifier

Frequently Asked Questions

Compatible with MS Windows Compatible with MacOS


eMail Verifier port 25 requirement
"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. Some independent SMTP servers support an additional port other than 25 (26, 587, 2525...) to allow users with authenticated access to connect to them even if port 25 is blocked. Unfortunately eMail Verifier can't use such alternative port as it needs to connect to each address SMTP relay server, not only your server. Relay servers (MTA) only work on port 25. In fact, all e-mail sent via the Internet is routed through port 25. When you run eMail Verifier on your computer, it always uses port 25 to connect to remote e-mail 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.

A few ISPs are blocking port 25. They are doing this to cut down on the amount of spam that is sent from their networks. All e-mail sent via the Internet is routed through the port 25, the channel used for communication between an e-mail client and an e-mail server. Port 25 blocking allows ISPs to block spam sent out through their networks, but it tends to punish the innocent that have a need to use tools like eMail Verifier or to send through e-mail servers other than those belonging to their ISP. The ISPs that block port 25 require their SMTP server to be used instead of the remote SMTP server or a SMTP server running on your computer.

Unfortunately, there is nothing we can do to change this. The 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.

Note that if your ISP is Comcast you can update your account to a Business Class account with full access to port 25. If your ISP is Verizon it appears you have to subscribe to a static IP address service by calling Verizon customer service at (800) 922-0204 (Please check with Verizon if that will indeed remove port 25 block). In the case you are connected through AT&T, port 25 can be unblocked at the request.

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?


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Stan Busk Stan Busk
May 20, 2019



Recent questions from our eMail Verifier users
Bad Gmail addresses marked as valid New
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Problème de connexion

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Stan Busk If you want to make the most of the software that you have acquired at Maxprog, do not miss the Stan's Blog. It is a library of Tutorials and Tips covering specific features and tipical problems you may have when using our tools. This page is updated regularly depending on the topics discussed in our public forums and issues reported thru our HelpDesk. If you are interested on what we are currently working on (or want to participate in beta testings) don't miss the Stan's Logbook.
For years, MAX Programming has provided companies around the globe with sophisticated and innovative solutions. Our commitment to quality is not only evident in our products, but also in our people. It is our mission in Professional Support Services to ensure that our products perform to the fullest of their ability in order to meet the business objectives of our customers. We provide the tools and information required for improved productivity. To accomplish this, we offer an array of services including: Technical Support, Education Services and Consulting Services.

Maxprog is part of an internet site network made of desktoolset.com, emaildesignstudio.com, familycash.com, icash.promo, maxbulkmailer.com, maxprog.com, maxprog.net, maxprog.org, maxprog.us, myrecipients.com, newslettercomposer.com, sharedcontents.com, stanbusk.com, stanbusk.pairserver.com, usertools.com.
eMail Verifier est un logiciel qui permet de vérifier les adresses e-mail d'une liste et afin de détecter celles qui ne sont pas bonnes ou sont obsolètes. Si vous êtes sur le point d'envoyer un message à une liste de distribution, eMail Verifier peut vous permettre d'économiser beaucoup de temps et d'argent.

eMail Verifier est idéal pour l'entreprise qui envoie des offres régulièrement à ses clients, ou bien l'organisation non lucrative qui envoie des bulletins électroniques à ses membres ou simplement si vous avez besoin de maintenir votre liste de contacts ou de clients libre d'adresses invalides ou obsolètes.

eMail Verifier est une solution très efficace qui permet de réduire radicalement le nombre de courriers rejetés et ainsi d'accélérer les envois.



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