Port 25 is traditionally used for sending emails via the Simple Mail Transfer Protocol (SMTP). Unfortunately, it is also commonly exploited by spammers and malicious actors to send spam and phishing emails, often from compromised computers within our network.
By blocking Port 25, we aim to:
Reduce Spam and Phishing Attacks: Blocking Port 25 helps prevent unauthorized use of our network for sending spam and phishing emails, thereby protecting all users from potential threats.
Improve Network Performance: Spam traffic can degrade network performance. By reducing such traffic, we can ensure that our IP ranges maintain better health reducing potential connectivity issues.
Repercussions and What You Need to Know
We understand that this change may impact some of you, particularly if you operate your mail servers or use email applications configured to send emails via Port 25.
Here's what you need to know:
Email Delivery via Port 25: If you use an email client or service that relies on Port 25 to send emails, you must reconfigure it to use an alternative port. Common alternatives include Port 587 or Port 465, typically used for secure, authenticated email submission.
Support and Assistance: If you need help reconfiguring your email client or server, please contact your email provider.
How to Change Your Email Port Settings
To avoid disruption in your email service, please follow these steps to change your port settings:
Open your email client settings.
Locate the outgoing server (SMTP) settings.
Change the port number from 25 to 587 or 465.
Ensure the "Use secure connection (SSL/TLS)" option is enabled.