port 25 blocked

Receiving Email But Not Able To Send An Email – Port 25 Blocked

Are you receiving emails but not able to send? Or your email worked in UAE and when you traveled abroad it stopped working? Or you’re receiving an error, Port 25 is blocked?

In this guide, we’ve covered all of these questions.

Sometimes it happens: You’ve opened up your favorite browser, open your favorite mail client, write some lines, insert the recipient’s address, and click on the send button. Suddenly you’ve received an error that your email is not delivered. But why this happens? You’re using the same browser, the same mail client when you were in your home country.

If you can’t send your email, there are higher chances that there’s a problem in your SMTP server. Simple Mail Transfer Protocol – the server is responsible for the transmission of the email delivery process. Many email services and clients use port 25 for SMTP to send an email. Although it’s a completely normal process, some ISP’s (Internet Service Provider) may have blocked this port in your area. The general cause is the SMTP port is blocked by a firewall or ISP may have blocked port 25 to prevent spamming. This is common in many abroad states like the EU, US, and Australia.

Some ISPs that block port 25 include:

  • AT&T
  • CableOne
  • Cox
  • BellSouth
  • Charter
  • MindSpring
  • MSN
  • NetZero
  • mails
  • Sympatico.ca
  • EarthLink
  • Verizon
  • MediaOne
  • People PC
  • Comcast ATTBI
  • Verio
  • Flashnet
  • Telus

Many ISPs in Europe and USA.

A simple fix is that you change your outgoing email server to Port 26. If somehow you’re still facing this issue then we’ve covered the top 6 solutions that have worked for most users.

Things to Do When Port 25 is Blocked

Check your Internet Connection: Its the simplest one. Make sure your internet connection is activated and is not on Limited state.

Check SMTP server details: This happens to most people traveling abroad. Many clients have set up their SMTP with wrong parameters. Double-check your SMTP details.

Verify your credentials: Check your username and password.

Check your SMTP server connection: Sometimes there’s no problem from your side and the server itself is down. It’s good that you check your SMTP server connection at this stage.

Change your SMTP port: A simple telnet can test your ISP block port 25. One of the tips here is that to change your port yo 587 or 465.

Check your antivirus or firewall settings: Sometimes antivirus and firewall settings prevent outgoing mail services. Switch these services off when you’re sending an important mail.

Generally, the issue will be resolved by using the solution provided above. If somehow you’re still facing the problem then contact your internet service provider. They will fix your problem in no time.

Port 25 Blocked FAQ’s

What can I do if port 25 is blocked?

You can change your port to 587 if your ISP has blocked port 25.

For what purpose Port 25 is used for?

Many email clients use Port 25 for Simple Mail Transfer Protocol to send out emails.