Introduction

This article describes how to unblock port 25.

Notes

• You can only unblock port 25 for five instances for each Tencent Cloud account.
• Make sure that you only use port 25 to connect to a third-party SMTP server for sending email. If you use your CVMs to send email directly, we reserve the right to permanently ban you from opening port 25.

Directions

1. Log in to the Tencent Cloud console.
2. Click your account name in the upper-right corner. Select Security Control.
3. In the left sidebar, click Unblock port 25 to go to the Unblock port 25 page.
4. Click Apply to unlock port 25 to bring up the Apply to unblock port 25 window.
5. Select a region and the CVM instance that need to be unblocked. Select I have read and agree to the port 25 usage agreement., as shown below:

   Make sure you have not used up your unblocking quota. You can check the remaining quota in the lower left of the Apply to unblock port 25 window.

   
6. Click OK to finish the process.