# Why use Topics?

> Topics let recipients opt out of one kind of email without unsubscribing from everything. That keeps engagement high and complaints low — which protects deliverability. Here's when to use Topics, and how they differ from Segments.

Every send starts with one decision: **who is this for?** Those recipients — a person, an audience, or a [segment](https://www.mailblastr.com/docs/segments/overview) — are the core of sending. By default everyone in that group receives the message, but not everyone in it wants every message.

**[Topics](https://www.mailblastr.com/docs/topics/overview)** give recipients a way to say *don't send me this kind of email* without unsubscribing from everything. Think of a Topic as a **contract with your recipients**: a promise that if they opt out of a content type, you'll honor it. Topics don't define who receives a message — they define **who asked not to** receive it. This page explains why that matters for deliverability and how Topics differ from segments.

## Why Topics improve deliverability

Deliverability is about landing in the inbox instead of spam, and **recipient engagement** is a key factor. Gmail, Outlook, and the rest track whether people open, click, or mark your mail as spam. When you send every marketing email to everyone, a slice of the list never engages — and that does real damage:

- **Lower open rates** — recipients ignore mail that doesn't interest them.
- **Higher spam complaints** — frustrated recipients hit *Report spam* instead of unsubscribing.
- **Falling sender reputation** — providers see low engagement and start filtering you to spam.

Topics give recipients agency and give you signal. When someone says *no promotional emails*, the system honors it while still sending the content they do want — so you keep the engagement and avoid the complaint.

## Without Topics: a single global unsubscribe

Without Topics, your unsubscribe page offers exactly one option: **unsubscribe from everything**. That's a blunt instrument — plenty of recipients who'd happily keep getting *some* of your mail leave entirely because of one too many emails about something they didn't want. With Topics, they can decline a single content type and stay subscribed to the rest, so you retain more engaged subscribers.

## When to use Topics

Topics are most valuable when you send **multiple types of marketing content** to the same audience. Common examples:

| Topic example | Description |
| --- | --- |
| Newsletter | Regular updates, articles, or curated content |
| Product Updates | New features, releases, and announcements |
| Promotions | Discounts, sales, and special offers |
| Events | Webinars, conferences, and meetups |
| Tips & Tutorials | Educational content and how-to guides |

## When you might not need Topics

If you only ever send **one** kind of marketing email — say a monthly newsletter and nothing else — Topics add complexity without much benefit. A simple subscribe/unsubscribe model is enough.

## Topics vs. Segments

Topics and [segments](https://www.mailblastr.com/docs/segments/overview) solve fundamentally different problems, and the distinction is the key to using both well.

| Aspect | Topics | Segments |
| --- | --- | --- |
| Who controls it | Your recipients | You (the sender) |
| Visibility | Shown on the unsubscribe page | Internal only (recipients never see them) |
| Purpose | Let recipients manage their preferences | Organize contacts for targeted sending |
| Example | "Newsletter", "Product Updates" | "Enterprise customers", "Free trial users" |

## How Segments and Topics work together

Segments are **who you're sending to**; Topics are **what you're sending**. When you send a [campaign](https://www.mailblastr.com/docs/campaigns/managing):

1. **Choose a Segment** — Pick the segment that defines your recipients — your sender intent.
2. **Label with a Topic** — Tag the content with a Topic so the system can respect recipient preferences.
3. **Send, minus opt-outs** — Everyone in the segment receives the message except those who opted out of that Topic.

For example, a product announcement sent to your *Enterprise Customers* segment, labeled with the *Product Updates* Topic, automatically excludes anyone who previously declined product updates. **Segments target; Topics protect preferences** — they work together without competing.

## Opt-in vs. opt-out Topics

When you create a Topic, you choose its default subscription behavior, and **you can't change it later**:

- **Opt-in (default)** — all contacts receive this Topic unless they explicitly unsubscribe (applies retroactively to every contact). Use it for broadly relevant content like product updates.
- **Opt-out** — contacts do *not* receive this Topic unless they explicitly subscribe. Use it for niche content only some users want, like a beta program or developer-focused updates.

> **Warning:** You cannot change the default subscription type after a Topic is created — choose opt-in vs. opt-out deliberately.

## Public vs. private Topics

- **Public** — every contact sees this Topic on the unsubscribe page.
- **Private** — only contacts already opted in can see it. Useful for exclusive content (a beta program, VIP announcements) you don't want to advertise to everyone.

## Best practices

- **Keep it simple** — aim for 3–5 clear content types; a long list of checkboxes overwhelms recipients.
- **Use clear names** — "Newsletter" and "Product Updates" communicate; "Category A" and "Misc" don't.
- **Add descriptions** — use the optional description to set expectations about frequency and content.
- **Always label campaigns with a Topic** — so recipients who declined that content don't receive it, and an unsubscribe can be scoped to that Topic rather than everything.

> **Note:** If you send a campaign **without** a Topic and someone unsubscribes, they're unsubscribed from **all** your mail. Labeling your content protects both you and your recipients. See [Topics](https://www.mailblastr.com/docs/topics/overview) to get started, and [customize your unsubscribe page](https://www.mailblastr.com/docs/settings/custom-unsubscribe) to show your Topics with your branding.