Personalized Email Automation at Scale.

MailerBit is an email automation platform that sends individually personalized emails to thousands of recipients. Each message contains unique content — tax amounts, billing details, progress reports, ROI projections — generated dynamically from your custom data fields.

What Is MailerBit and Why Use It?

MailerBit is a SaaS email automation platform built by SOA Invest Sp. z o.o. It connects to your contact database and dynamically injects per-recipient data — such as tax amounts, account numbers, attendance rates, or investment returns — into every outgoing email. Unlike traditional email marketing tools that only personalize names and greetings, MailerBit supports unlimited custom data fields of any type: text, numbers, dates, and currencies.

Typical use cases include: accounting firms sending monthly PIT/VAT notifications with individual tax amounts, language schools distributing attendance-based billing to parents, real estate funds delivering personalized ROI projections to investors, recruitment agencies crafting individually tailored outreach at scale, and gaming platforms sending per-player achievement summaries. All campaigns can run on configurable recurring schedules — daily, weekly, monthly, or on custom dates.

Recurring Campaigns — Automated Scheduled Email Sends

MailerBit recurring campaigns allow you to schedule email sends on repeating dates: the 1st, 15th, last business day, or any custom day of the month. Once configured, each campaign runs automatically on its schedule, pulling the latest data from your contact database. This feature is used by accounting firms for monthly tax reminders, language schools for attendance-based billing cycles, and any business with regular client communication needs.

Schema-less Custom Fields — Unlimited Per-Contact Data Variables

MailerBit custom fields let you define unlimited per-contact data variables without a fixed database schema. Supported field types include text, integers, floats, dates, and currencies. Examples: "VAT Amount", "Attendance Rate", "Account Number", "Investment ROI", or any business-specific data point. Each field becomes a dynamic merge tag available in your email templates, automatically replaced with the recipient's individual value at send time.

Visual Template Engine with Dynamic Merge Tags

The MailerBit template engine provides a visual editor where you insert dynamic merge tags (placeholders) into your email design. At send time, each tag is replaced with real data from the recipient's custom fields. One template generates thousands of uniquely personalized emails — each containing different amounts, names, dates, calculations, and any other per-recipient data stored in your MailerBit contact list.

Domain Verification & Warm-up

MailerBit requires you to verify your own domain before sending campaigns. This protects your sender reputation and ensures maximum deliverability from day one.

What Is Domain Warm-up?

When you start sending emails from a new domain, email providers (Gmail, Outlook, Yahoo) don't yet trust your domain. If you send thousands of emails immediately, they may be flagged as spam. Domain warm-up is a gradual process: you start with a smaller daily sending volume and increase it over several days, building a positive reputation with inbox providers.

MailerBit handles warm-up automatically. During the first days of your subscription, your daily sending limit increases progressively. After the warm-up period, you have full access to your plan's monthly email quota with no daily cap.

Why We Require Domain Verification

Unlike platforms that let you send from a shared domain, MailerBit requires you to verify your own domain with DKIM and Return-Path DNS records. This means:

Your emails come from your domain, not a shared address — boosting trust and brand recognition.
Higher inbox placement — authenticated domains pass DKIM/SPF checks, reducing spam filtering.
Isolated reputation — your deliverability is never affected by other users' sending behavior.

Automatic Warm-up Schedule

Day 1

200

emails

Day 2

500

emails

Day 3

1,000

emails

Day 4

2,000

emails

Day 5+

Full

plan limit

Warm-up is fully automatic — no manual intervention needed. If a campaign exceeds your daily limit, remaining emails are sent automatically the next day.

Global Use Cases

Accounting Firms — Automated Monthly Tax Notifications

Accounting firms use MailerBit to automate monthly PIT and VAT tax notifications. Each client receives an email containing their exact tax amount, unique bank transfer details, and payment deadline — all pulled from per-client custom fields. Campaigns are scheduled to run automatically on the 20th of each month, eliminating manual work entirely.

Language Schools — Attendance-Based Billing and Progress Reports

Language schools use MailerBit to calculate and send monthly tuition fees based on each student's attendance data. Parents receive personalized reports containing the exact balance due, number of classes attended, student progress metrics, and payment instructions — all generated dynamically from attendance fields stored per student in MailerBit.

HR & Executive Search — Personalized Recruitment Outreach at Scale

Recruitment agencies and executive search firms use MailerBit to send personalized outreach to hundreds of top-level candidates simultaneously. Each email includes not just the candidate's name, but also their company's latest public achievement and the specific technology or domain they manage — all stored as custom fields per candidate.

Result: Candidates perceive each message as individually written by a senior partner, not generated by automation.

Real Estate Investment — Personalized ROI Projections for Investors

Investment funds and real estate developers use MailerBit to send property offers to investors with personalized financial projections. The system injects each investor's capital amount and calculates projected annual ROI based on their existing portfolio data stored in custom fields. Example output: "With your capital of $250,000, this property investment projects a 12.4% annual return."

Result: Investors receive ready-made financial analysis tailored to their portfolio — not generic marketing materials.

Gaming & Gamification — Per-Player Achievement Emails for Retention

Game studios and gamification app developers use MailerBit to send weekly personalized achievement summaries to each player. Each email contains individual stats pulled from custom fields: "This week you defeated 47 opponents, ranking you in the top 3% of players in Europe. You need 1,200 more XP to reach Level 15." This per-player parameterization drives significant engagement and retention improvements.

Result: Measurable engagement and retention boost — making the Professional plan at $29/month highly cost-effective for any app with an active user base.

Try MailerBit Demo — No Registration Required

Experience MailerBit firsthand before committing. The interactive demo lets you explore the full interface: create contacts with custom fields, build email templates with dynamic merge tags, and see how per-recipient personalization works in practice. No account or credit card needed.

Launch Demo Go to Full App

MailerBit Launches March 3, 2026

MailerBit is a data-driven email automation platform with three pricing plans starting from $9/month. Full pricing details and registration will be available at launch.

Days

Hours

Minutes

Seconds

Coming Soon — March 3, 2026 at 09:00 CET