How to Add Custom Contact Attributes

Last updated on October 22, 2026

Mailzzy stores standard details like email, name and address for every contact. Custom attributes let you store anything else you track.

What Custom Attributes Are

A custom attribute is an extra field on every contact, such as plan, birthday, store location or membership level. Your account can have up to 30 custom attributes.

Create an Attribute

Go to Contacts and open Attributes.
Select Create an attribute.
Enter a name and choose the type of information it holds.
Save the attribute.

Attribute Types

Type	Use it for
Text	Free text, such as a company name
Number	Numbers, such as loyalty points
Date	Dates between January 1, 1900 and December 31, 2050, such as a birthday
Category	One choice from a list, such as membership level
Multiple-choice	Several choices from a list, such as interests
Boolean	Yes or no, such as VIP customer
User	A member of your Mailzzy team, such as an account owner

Category and Multiple-choice attributes need a list of options. You can add up to 100 options.

Fill in Attributes

Match a column to the attribute when you import contacts.

Map Mailchimp merge fields to it when you migrate from Mailchimp.

Edit a single contact to fill it in by hand.

Use Attributes in Segments and Emails

Segments: filter contacts by attribute value. You'll find your attributes under Custom Fields in the segment builder.

Emails: add an attribute to your email as a merge tag. Attributes appear under Attributes in the personalization menu of the campaign, template and automation editors.

Delete an Attribute

Deleting an attribute erases its value from every contact that has one. This can't be undone.

Note: Before you delete an attribute, check where it's used. Segments and automations that use it stop working, and emails that include it as a merge tag send it as blank.