You will get an app for sending mailings from Google Sheets via Gmail or Workspace
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Top Rated
Project details
You will receive an Application for sending mailings (HTML emails) from Google Sheets via GMAIL or Gmail in Google Workspace.
Sending Mailings with GMAIL
The free version of Gmail allows sending up to 500 emails per day.
The paid version (Workspace, approximately $7/month) allows sending mailings of up to 2000 emails per day.
Application Features:
• Apps Script Application installed on your account in Google Sheets.
• Send mailings to your customer database directly from Google Sheets.
• Paste HTML email code directly into a Google Sheets cell.
• A "Help" sheet that describes Gmail's free and paid services in Google Sheets.
The database includes:
• Email address
• First name
• Last name
• Custom variable
The application offers four key functions:
• SET SEND TIME (enables scheduling mailings at a specific time)
• SET BATCH SIZE (allows setting the number of emails sent per minute to improve delivery rates)
• SEND EMAILS (triggers email sending)
• SEND SCHEDULED EMAILS (sends emails based on a set schedule)
• Add a subject line for your messages.
Additional Features for a Fee:
For an extra fee, I can add variables and create custom HTML templates.
Sending Mailings with GMAIL
The free version of Gmail allows sending up to 500 emails per day.
The paid version (Workspace, approximately $7/month) allows sending mailings of up to 2000 emails per day.
Application Features:
• Apps Script Application installed on your account in Google Sheets.
• Send mailings to your customer database directly from Google Sheets.
• Paste HTML email code directly into a Google Sheets cell.
• A "Help" sheet that describes Gmail's free and paid services in Google Sheets.
The database includes:
• Email address
• First name
• Last name
• Custom variable
The application offers four key functions:
• SET SEND TIME (enables scheduling mailings at a specific time)
• SET BATCH SIZE (allows setting the number of emails sent per minute to improve delivery rates)
• SEND EMAILS (triggers email sending)
• SEND SCHEDULED EMAILS (sends emails based on a set schedule)
• Add a subject line for your messages.
Additional Features for a Fee:
For an extra fee, I can add variables and create custom HTML templates.
Programming Languages
JavaScriptDesktop App Expertise
App Design, Application Setup & Installation, Development, Performance Optimization, Application Review & OptimizationWhat's included $110
These options are included with the project scope.
$110
- Delivery Time 5 days
- Number of Revisions 1
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SS
Stefania S.
Jun 30, 2026
TV Subscriptions User Feedback (Poland)
It was really lovely working together, and we really appreciate your prompt responses and diligent work. I hope we can collaborate on similar studies in the future!
The work done will help our client improve their product for users across various European markets.
The work done will help our client improve their product for users across various European markets.
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joseph x.
Jun 23, 2026
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About Mariusz
EXPERT EMAIL DEVELOPER || Email Marketing Strategist & AI Architect II
99%
Job Success
Opole, Poland - 4:05 pm local time
With 15+ years of experience, 4,000+ projects delivered for 1,900+ clients worldwide, I build production-ready email systems - not just templates - combining clean HTML/CSS, lifecycle automation, marketing strategy, deliverability expertise, and AI-driven workflows under one roof. Top Rated Plus on Upwork with $700K+ in earnings.
What I do:
1. Email Development (Core)
Custom HTML/CSS email builds - mobile-responsive, dark-mode-ready, cross-client tested. I work across Mailchimp, HubSpot, Salesforce / Pardot, Marketo, Klaviyo, ActiveCampaign, Campaign Monitor, SendGrid, and Iterable. In 2015, Mailchimp recognised me for identifying and fixing critical rendering bugs in their templates. Certified Mailchimp Partner.
2. Email Marketing Strategy & Execution
End-to-end email marketing - audits, campaign planning, segmentation, lifecycle automation (welcome, nurture, re-engagement, winback), A/B testing, and performance optimisation. I build scalable, compliant email programs with predictable long-term performance. I handle both strategy and execution end-to-end.
3. AI Architecture & Intelligent Automation
I build AI-powered audit and automation systems connected directly to your ESP/CRM via MCP servers. AI analyses your flows, campaigns, deliverability, and engagement data in real time - producing structured audit reports and prioritised fix lists. Examples: automated Klaviyo flow audits with copy rewrites, real-time deliverability monitoring, and engagement scoring. I also build RAG MCP servers that let AI reference your internal docs, brand guidelines, and performance history during audits and content generation.
4. Front-End & Automation Development
Custom applications, internal tools, dashboards, and integrations using JavaScript, Python, React, Google Apps Script, and n8n. I connect CRMs, ESPs, databases, Google Sheets, and APIs into unified automated workflows.
Core services:
★ Custom email development (HTML/CSS, dark mode, responsive, cross-client)
★ Email marketing strategy, audits & campaign execution
★ AI-powered ESP/CRM audits via MCP server integration
★ RAG MCP servers for context-aware AI recommendations & content generation
★ Lifecycle automation (welcome, onboarding, nurture, re-engagement, winback, lead scoring)
★ Deliverability setup & troubleshooting (SPF, DKIM, DMARC, sender reputation)
★ Segmentation strategy (openers, clickers, inactive users, RFM, predictive)
★ A/B testing, reporting & performance optimisation
★ Advanced ESP customisation (HubSpot HubL, Salesforce AMPscript, Marketo Velocity)
★ AI agents & n8n automation systems
★ CRM & ESP integrations (HubSpot, Salesforce, Marketo, Mailchimp, Klaviyo, ActiveCampaign)
★ Custom Google Sheets & Apps Script solutions (dashboards, triggers, integrations)
★ API-based integrations & webhook workflows
★ Cross-client email testing (Litmus, Email on Acid, dark mode, Outlook VML fixes)
Why work with me:
★ 15+ years in email development and email marketing
★ 4,000+ projects for 1,800+ clients (Microsoft, Netflix, Unilever, Toyota, Adobe, BBC, Meta, Amazon Prime Video, TikTok, Adidas, Sony, Coca-Cola, Hyundai, LG, Renault, Bayer, 3M, and more)
★ Member of 32 Upwork Talent Cloud groups (Enterprise Professionals, Microsoft UTC, Netflix Print Production, Unilever, Tata Communications, Holland & Barrett, Janus Henderson, and others)
★ AI-powered audit and automation capabilities (MCP + RAG architecture)
★ End-to-end ownership - strategy, development, execution, optimisation
★ Clean, maintainable code and scalable architecture
Certificates: HubSpot Marketing Software, HubSpot Email Marketing, HubSpot Contextual Marketing, Mailchimp Email Automations, Mailchimp Foundations, Python (Alison), Salesforce for Admins, Managing DNS, Advanced CSS Media Queries, Google Ads Measurement.
Skills: HTML5, CSS, Email Development, Email Deliverability, AMPscript, HubSpot HubL, Marketo Velocity, JavaScript, Python, React, Google Apps Script, n8n, APIs & Webhooks, MCP Servers, RAG Architecture, AI Agents, Marketing Automation, CRM Integrations
I use AI as a development and analysis accelerator - speeding up coding, testing, auditing, and iteration - while maintaining full control over architecture, logic, and production quality.
Availability:
★ Mon–Thu: 3:00 AM – 11:00 AM EST, 3:00 PM – 7:00 PM EST
★ Friday: 3:00 AM – 11:00 AM EST
Steps for completing your project
After purchasing the project, send requirements so Mariusz can start the project.
Delivery time starts when Mariusz receives requirements from you.
Mariusz works on your project following the steps below.
Revisions may occur after the delivery date.
Installation
After purchasing this application, I will install it on your Google Sheet