SMTP is blocked by VPN & won’t let me send emails

Ivan Jenic
by Ivan Jenic
Troubleshooting Expert
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Affiliate Disclosure

  • VPNs have a habit of blocking SMTP as a security measure.
  • For example, you cannot send emails when connected to NordVPN without changing a few settings first.
  • If you want to learn more about email issues, check out our dedicated Email Hub.
  • If you are interested in other similar tutorials guides, check out our VPN How-To page.
SMTP blocked by VPN

Is SMTP blocked by VPN on your Windows PC? Are you having issues sending or receiving emails in your custom webmail while on VPN? Do not panic! Windows Report will show you how to bypass this problem.

SMTP (Send Mail Transfer Protocol) is the protocol used by an outgoing mail from a PC. This protocol is generally used during Mail exchange.

SMTP is provided by ISP and has a particular address through which these mail exchanges are sent from such as TCP 25 used by many older email client programs.

Reasons why your VPN blocks SMTP

SMTP can be blocked by different reasons apart from your VPN. This particular problem can especially be felt when you travel outside your ISP coverage area.

You may have difficulties sending emails from email clients such as Microsoft Outlook, Mozilla Thunderbird, and other email clients. This is usually caused due to differences with the ISP on your device.

For instance, some hotels have checks that search if your ISP is from that region; however, if it’s not, your SMTP may be blocked.

Another reason why SMTP is blocked while you are on VPN is because of “spam”. Many reputable VPN providers do not keep logs which means they must block spam messages. One way they reduce spam messages is by blocking SMTP traffic.

Most VPN block outgoing SMTP on port 25; this is because this port is unsecured. However, MS Outlook and several email client programs use this port as the major port for SMTP mails.

Meanwhile, the WindowsReport team has come up with applicable solutions that can help you work around the VP SMTP blocked problem. These solutions are based on practical experience and can resolve the problem of your VPN blocking SMTP.

How can I send emails when using a VPN?

1. Contact your VPN provider to the whitelist email server

To get rid of this type of issue, you can switch to the best VPN on the market, Private Internet Access. This tool has a wide range of features and setup possibilities plus great compatibility with Windows 10 PCs. Just like many other VPN providers that have no-log policies, Private Internet Access must block outgoing SMTP traffic due to the spam associated with the use of VPN services. This is a standard procedure used for the security and privacy of their subscribers and it is merely another sign that the service is actually very secure. Fortunately enough, they can be contacted so that your specific email server can be whitelisted. All you need to do is submit screenshots showing all of the following settings that you currently have entered to use in your email program:
  • The email addresses being blocked
  • The SMTP/outgoing email server name for the above address
    • For example,, etc.
  • The Port number used to connect to the mail server
  • Your SSL setting
    • Whether it is enabled or disabled
    • It may appear as TLS or SSL
Alternatively, you can also bypass these blocks by simply changing the SMTP server settings on your email client to the TCP port.
Private Internet Access

Private Internet Access

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2. Switch to a newer email client

Many new email clients do not use TCP port 25 for their SMTP services. If your VPN still blocks your SMTP, you would have to upgrade to a newer version. Alternatively, you can replace your email client with the latest email clients that use much more secure TCP ports. Some of the latest email clients we recommend include Mailbird – winner of Most popular mail alternative of 2020. This is a great tool that has a free version and includes multiple email accounts. It also allows you to classify and organize your emails thus making your email work easier. Meanwhile, there are some VPN providers that don’t block SMTP mails on TCP 25. If you use your email client regularly, it may be beneficial for you to switch your VPN service to SMTP-friendly VPN. We’ll list these VPN services below.


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3. Use a webmail provider

Most of the complaints about VPN SMTP blocked issues emanated from custom webmail users. An example of custom webmail is However, using standard webmail is an excellent solution since most webmail provides an SMTP server on an SSL port TCP 465. Moreover, many VPN do not block this port because it is secure. This is because these webmail providers are not blocked by several VPN service providers. They also have a huge user base and provide excellent anti-spamming and security features for users. Also, they are free to use and easy to access, unlike email clients. In addition, many webmail providers provide anti-spamming features for users which reduces the number of spam messages entering your inbox. You can pick from many available webmail clients online. However, we recommend the use of MailbirdGmail, Yahoo Mail , and Hotmail.

4. Temporarily disable VPN

A quick fix method that bypassed the SMTP blocked on VPN issue is to temporarily disable your VPN, send the email with your email client, and then enable your VPN afterward. This would effectively work; however, there are many dangers involved. You could be exposed to hacks and attacks from trackers. Also, if you’re sending a sensitive email it can be intercepted by your ISP or government agency. This can be dangerous if you’re in a region with strict government censorship on the Internet.

Best VPN tools to use with SMTP


CyberGhost is a top-rated VPN service provider worldwide. developed by Kape Technologies, they offer servers with fast speed, strong encryption technologies, and reliable performance.

The VPN provides extra security features such as antivirus protection and Ad-blocker services which are found in antivirus programs.

In addition, the VPN adheres to a strict no-logs policy. CyberGhost is a well-rounded and possess excellent customer service support. The user interface is simple to use and you can be connected with a simple click.



Send emails safely while avoiding spam with the help of this great VPN service. Now at a discount price for a limited time only!
$2.75 /mo. Buy it now!


IPVanish is a VPN service owned by StackPath, LLC, and it has over 1000 servers in 6 countries giving you lots of options to choose from when using this service as you can connect from anywhere in the world.

IPVanish has some of the fastest server speeds which enable greater performance and top-notch security. Your connections are secured thanks to their military-grade encryption which keeps your information hidden while you are online.

However, the VPN comes with 3 different packages that are costlier than rival VPNs with the basic plan coming at $6.49 monthly billed annually with a 7-day money-back guarantee.



Send emails safely while avoiding spam with the help of this great VPN service. Now at a discount price for a limited time only!
$3.70/mo. Buy it now!


NordVPN is a VPN service owned by Tefincom & Co., S.A., and it has over 5400 servers in 61 countries which are strategically placed mostly in Europe to ensure fast server speeds.

The VPN also offers multi-platform support and is accessible to many platforms such as Windows, and other platforms. The tool fully supports SMTP. so you should not encounter any issues while using it.



Send emails safely while avoiding spam with the help of this great VPN service. Now at a discount price for a limited time only!
$3.49/mo. Buy it now!

Hide My Ass (HMA)

Hide My AssHMA have extensive global server coverage with over 900+ servers in 190+ countries. This means you always have access to any of their servers from any region in the world and enables you to easily bypass geo region blocks.

In addition, HMA also provides fast connection speeds which make it an excellent choice for Windows users who likes speed. Your privacy is also taken care of with the advanced features that ensure your IP address is not revealed while surfing the web. Also, it protects you from DDoS attacks.

Download HMA

CyberGhost and NordVPN are highly recommended by our team of experts. Both VPN services provide comprehensive VPN features and keep no logs of your online activities.

Have you tried any other solution? Let us know by commenting below or you can ask questions if any. We would gladly respond.

FAQ: Learn more about SMTP servers and VPNs

  • Why does my VPN block SMTP?

VPNs block emails by default as a way of avoiding spam messaging. In fact, even antivirus tools are known to have this issue.

  • How do I enable SMTP with VPN?

Simply contact your VPN provider’s technical support and ask them to whitelist your particular SMTP. Additionally, you could also try using a different email client.

  • Who provides you with an SMTP?

Your SMTP is generally provided by your ISP.

Editor’s Note: This post was originally published in June 2018 and has been since revamped and updated in May 2020 for freshness, accuracy, and comprehensiveness.

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