#1120 – What Is “Mailer-Daemon” and Why Is It Sending Me Email?

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#1120 - What Is "Mailer-Daemon" and Why Is It Sending Me Email?

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This Week on Ask Leo!

What Is "Mailer-Daemon" and Why Is It Sending Me Email?

What Is "Mailer-Daemon" and Why Is It Sending Me Email?
It's a friendly helper.

Get an email "from" mailer-daemon? There's a good reason this mysterious sender keeps showing up.

Read: What Is "Mailer-Daemon" and Why Is It Sending Me Email?

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What

What's My IP Address?
The information exposed to every website you visit.

You might be sharing more than you think when you visit a website. Your IP address, your browser details, and even what you searched for to get there is all visible. I'll explain what websites see when you show up and why it matters.

Read: What's My IP Address?

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How Two-Factor Authentication Works and Why You Need It Right Now

How Two-Factor Authentication Works and Why You Need It Right Now
It keeps hackers out.

Your password alone might not be enough to keep hackers out. Two-factor authentication adds a second layer of protection that stops intruders even when they know your password. I'll explain how it works, why you need it, and how to set it up without making your daily log-in a hassle.

Read: How Two-Factor Authentication Works and Why You Need It Right Now

-

Should I Download Windows 10 Updates?

Should I Download Windows 10 Updates?
Oh, yes.

Windows 10 is past its end-of-support date, so why does Windows Update keep delivering updates? And should you keep taking them? My answer is a definite yes, and the reasons are more important than you might think.

Read: Should I Download Windows 10 Updates?

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Recognizing and Avoiding Dark Patterns

Recognizing and Avoiding Dark Patterns
The dark side plays tricks.

Dark patterns are sneaky design tricks built to work against you. I'll break down some of the most common and show you what to watch for before you click.

Read: Recognizing and Avoiding Dark Patterns

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Recognizing and Avoiding Dark Patterns

Dark patterns are sneaky design tricks built to work against you. I'll break down some of the most common and show you what to watch for before you click.

Watch: Recognizing and Avoiding Dark Patterns


What's My IP Address?

You might be sharing more than you think when you visit a website. Your IP address, your browser details, and even what you searched for to get there is all visible. I'll explain what websites see when you show up and why it matters.

Watch: What's My IP Address?


Should I Download Windows 10 Updates?

Windows 10 is past its end-of-support date, so why does Windows Update keep delivering updates? And should you keep taking them? My answer is a definite yes, and the reasons are more important than you might think.

Watch: Should I Download Windows 10 Updates?


What Is "Mailer-Daemon" and Why Is It Sending Me Email?

Get an email "from" mailer-daemon? There's a good reason this mysterious sender keeps showing up.

Watch: What Is "Mailer-Daemon" and Why Is It Sending Me Email?


How Two-Factor Authentication Works and Why You Need It Right Now

Your password alone might not be enough to keep hackers out. Two-factor authentication adds a second layer of protection that stops intruders even when they know your password. I'll explain how it works, why you need it, and how to set it up without making your daily log-in a hassle.

Watch: How Two-Factor Authentication Works and Why You Need It Right Now


 
Posted: May 5, 2026 in: 2025
Shortlink: https://newsletter.askleo.com/9401
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I'm Leo Notenboom and I've been playing with computers since I took a required programming class in 1976. I spent over 18 years as a software engineer at Microsoft, and after "retiring" in 2001 I started Ask Leo! in 2003 as a place to help you find answers and become more confident using this amazing technology at our fingertips. More about Leo.