Custom Fields — Personalize Beyond the First Name

Real Personalisation Starts Where the First Name Ends

Most email tools let you stick a first name into a greeting and call it personalisation. That's polite, but it's not what gets a recipient to actually do something. What gets them to act is seeing the specific amount they owe, the exact date a payment is due, the renewal price for their plan, their child's attendance rate, the balance in their account. The numbers and dates that matter to them, personally.

MailerBit custom fields are how you put that data in front of them. Define any field you need — no fixed schema, no IT ticket, no waiting on the platform vendor to add it. VAT Amount, Quarterly ROI, Attendance Rate, Policy Renewal Date, Property Number — whatever your business tracks becomes a merge tag you can drop into any template and every recipient sees their own value.

Five Data Types That Cover Anything Real

Typed fields keep your data clean and your templates predictable:

• Text — Names, account numbers, labels, free-form notes. Drop it in straight or transform it with filters like {{name | upper}}.
• Integers — Whole numbers — quantities, counts, loyalty points, invoice numbers.
• Floats — Decimal numbers — percentages, rates, measurements. Round inline: {{roi | round(2)}}.
• Dates — Billing periods, due dates, renewal anniversaries, report windows.
• Currencies — Monetary values stored with full precision and rendered with the right thousand separators and decimals in every email.

From Custom Field to Inbox

Every field you define is immediately available in the template editor as a merge tag. A field called vat_amount goes into your template as {{vat_amount}}. When the campaign sends, MailerBit reads each recipient's value and inserts it into the email — one template, hundreds or thousands of individually written messages.

Need to calculate on the fly? The template engine supports math expressions and filters directly inside merge tags. {{net_amount * 1.23}} applies VAT inline. {{(current_value - initial) / initial * 100 | round(2)}}% shows each investor their own percentage return, correctly formatted, calculated at send time. No spreadsheets, no pre-processing — the platform does the arithmetic.

What This Looks Like in Real Businesses