Segmentation: groups of conditions for real targeting

Sending the same email to your entire list is like shouting the same thing into a crowded square: it'll land with some people and miss most of them. Segmenting is the opposite: speaking to each group about what actually matters to them. And the good news is you don't need a thousand separate lists to pull it off — one master list plus groups of conditions is all it takes.

In this guide you'll learn to build precise segments by combining conditions with AND and OR — the concept that trips people up the most at first, and the one that gives you the most power once you get it.

1. Why segment (instead of duplicating lists)

The most common mistake is keeping "Argentina List," "Chile List," "VIP Customers List," "Newsletter List"… and ending up with the same contact duplicated across five places, impossible to maintain. The professional approach is the opposite: one master list, and at send time, you apply a segment that filters who actually receives it.

A segment doesn't duplicate or move contacts — it's a query that says "out of my whole list, show me only the ones who meet these conditions." Change the conditions tomorrow and you've got a different audience, without touching the underlying base.

2. Create a new segment

From your list, go into the segmentation section and choose to create a new one. You'll be able to pick from three paths:

• Custom: you define the conditions yourself from scratch. This is what we cover in this guide.
• Predefined: ready-made templates for common cases (for example, "opened but didn't click").
• RFM: automatically segments by Recency, Frequency, and Monetary value. Ideal for e-commerce.

Start with a custom segment to understand how it works under the hood.

3. Add your first condition

A condition always has three parts: a field, an operator, and a value. For example:

Country · is · Argentina

Fields can be subscriber data (email, name, subscription date, any custom field), geolocation (country, state, city), or device. And the operators change depending on the field: is / is not / contains / doesn't contain / greater than / less than, and so on.

4. Combine conditions with AND

This is where it gets interesting. Inside a group, you can stack several conditions, combined with AND: the subscriber has to meet all of them to qualify. For example:

Country is Argentina · AND · Last campaign opened Yes

That gives you "people in Argentina who also opened your last campaign" — a smaller, hotter group than either condition alone. The more conditions you stack with AND, the smaller and more precise the group gets.

5. Add another group with OR

What if you want to reach two different audiences in the same campaign? That's what groups are for. Each group is a set of conditions joined by AND, and between groups they combine with OR: meeting just one of the groups is enough to land in the segment.

Read it like this: "engaged Argentines (Group 1) or VIPs from anywhere (Group 2)." A VIP from Mexico doesn't meet Group 1, but does meet Group 2, so they're in anyway. This is the single most powerful idea in all of segmentation: AND narrows, OR combines.

Tip: if a segment returns fewer people than you expected, it's almost always because you've stacked too many AND conditions in the same group. If it returns too many, you probably need an additional AND condition to narrow it down.

6. Segment by behavior and tags

The most valuable segments aren't built on static data (country, name) — they're built on behavior: what the person actually did. You can filter by:

• Opened / didn't open a specific campaign.
• Clicked / didn't click a link.
• Date of last open (for example, "hasn't opened in 90 days" for a re-engagement campaign).

And by tags, which are labels you assign (VIP, promo, newsletter). A single contact can carry several tags, and each one is a ready-to-use segmentation condition. How tags get created and assigned is covered in lists and subscribers.

Important: avoid segmenting by email domain (for example, "only @gmail.com"). Receiving servers can interpret that kind of send as a targeted attack and block it.

7. Preview and use the segment

Before sending, always preview: arrobaMail shows you how many subscribers match your conditions. That number is your sanity check — if it's 0, or it's your entire list, something in the conditions is off.

Once it looks right, save the segment and apply it when you create a campaign: instead of sending to the whole list, you send only to that audience. You can reuse the same segment in future campaigns or use it as a condition in an automation.

Common mistakes to avoid

• Confusing AND with OR. "Customers AND prospects" describes nobody who's both at once → you get 0. What you meant was "customers OR prospects."
• Segments that are too narrow. Precision is good, but a segment of 12 people rarely justifies a whole campaign. Find the balance.
• Forgetting to preview. Sending to a segment without checking how many people are in it is the easiest way to get an unpleasant surprise.
• Not using behavior. Segmenting only on static data leaves the most valuable layer on the table: what people actually do.

Next steps

You now know how to build precise audiences. To get the most out of it:

1. Review how lists, tags, and hygiene are managed in lists and subscribers.
2. Put your segments to use in a campaign by following creating your first campaign.
3. Measure whether segmenting improved your results with interpreting reports and metrics.