Term: Port 25

Port 25 is the default port your computer communicates with when you’re connecting to a remote email server to send an email. Port 25 is the SMTP mail-sending port.

Port 25 can sometimes cause problems while you are working remotely. Many hotels and other facilities intercept mail being sent to any mail server on port 25 and redirect it through their own mail server. They can also impose a cap on the amount of email that you send.

« Back to Glossary Index
Free Newsletter!

Free Newsletter!

Subscribe to The Ask Leo! Newsletter and get a copy of The Ask Leo! Guide to Staying Safe on the Internet – FREE Edition. This ebook will help you identify the most important steps you can take to keep your computer, and yourself, safe as you navigate today’s digital landscape.

Then each week in The Ask Leo! Newsletter you’ll get even more tips, tricks, answers and ideas to help you use your technology more effectively and stay safe doing so.

Check your email to confirm!