Most people do not struggle with writing emails. They struggle with when to send them, because nobody ever handed them a clean mental model for it.
The model is called event-driven, and you and I should spend two minutes on it, because once it lands, every email decision in your business becomes obvious.
What "event-driven" means
Think of a hotel bell on the front desk.
The receptionist does not check the lobby every five minutes to see whether someone has arrived. Guests ring the bell, and the ring triggers the response.
No ring, no response. The bell is the event.
Event-driven email works the same way. You do not sit down on Tuesdays wondering who to write to.
Something happens, and that happening triggers the email.
The alternative, checking and remembering, is exactly where emails get forgotten. People fundamentally run their follow-up on memory, and memory is the worst scheduler there is.
Your funnel already rings the bell
Here is the good news: in this system, the bells ring themselves.
Two events matter most.
A Lead event fires when someone declares themselves:
- Fills a form.
- Starts a chat with your receptionist.
- Books a call.
Their details land in your CRM as a contact.
A Purchase event fires when someone pays: through a Tally form with Stripe attached, or for any product you sell.
Every Lead and Purchase on your website is captured and dispatched automatically, with the person's details attached.
The only question left, and it is now a much smaller question, is which emails those events should trigger.
Two kinds of email
Transactional emails answer an event.
A Lead fires, and a "thanks, here's what happens next" goes out. A Purchase fires, and the receipt and access details go out.
One event, one email, immediately, to one person.
Marketing emails do not wait for an event.
Newsletters, weekly tips, offers: sent on your schedule, to everyone who opted in.
Different triggers, different rhythm, and, as you are about to see, different sending advice.
Deliverability is the whole game
Before the how, the thing that outranks everything else: an email that lands in spam did not happen.
Deliverability lives and dies on your domain's reputation. The technical trio (SPF, DKIM, DMARC) plus a history of real people opening mail from your address.
The safest reputation you own is the one attached to your everyday Google Workspace or Gmail account, built over years of ordinary correspondence.
This is why there is no black-box email sender bundled into the system. Every option below sends from infrastructure whose reputation you control.
That is the principle; the rest is plumbing.
Transactional, option 1: Google Sheets + Apps Script
You already know your receptionist can post captured data to a Google Sheet mid-chat, and Lead and Purchase events can land in a sheet the same way.
Google Sheets comes with Apps Script, Google Workspace's built-in scripting studio.
A short script watches the sheet for new rows and sends an email through your own Gmail whenever one appears. New booking row, confirmation email. New payment row, receipt.
No third-party tool, no subscription, sender reputation fully yours.
And you do not have to write the script: your Claude Code trainer will.
Transactional, option 2: Zapier + Google Sheets + Gmail
Prefer clicking to scripting?
Zapier is an automation service that connects apps with "when this, do that" rules, no code involved.
The rule here is one line: when a new row appears in the sheet, send a Gmail.
You assemble the email template in Zapier's editor and stay entirely inside tools you already use. It costs a Zapier plan at volume, and it takes about ten minutes to set up.
Same shape as option 1, different trade: money for convenience.
Marketing: your CRM plus your own Gmail
For the weekly newsletter, the list is not something you build.
It already exists: your CRM holds every lead your receptionist and forms have ever captured.
This is where MCP earns an introduction. MCP is a standard that lets an AI assistant connect directly to your actual tools, with your permission, and act on them.
With it, your assistant pulls the audience using the searchSBOSCRMContacts tool, drafts the newsletter with you, and sends it through your own authenticated Gmail connection.
The weekly send becomes one conversation: "pull everyone who became a lead this month and send them this."
From your address, with your reputation, to people who actually know who you are.
Scaling up: forward events to an email platform
When volume outgrows Gmail, you do not rebuild anything. You redirect the events.
Every Lead and Purchase event can be forwarded, with a per-account setting, to any endpoint you choose.
Point it at a dedicated event-driven email platform (customer.io, Dittofeed, Loops, Brevo, take your pick) and those tools receive your events natively, because events are the language they are built on.
They give you journeys triggered by events ("purchase, then a five-email onboarding sequence") plus scheduled campaigns, in one place.
Transactional and marketing, driven by the same bells your funnel was already ringing.
Unsubscribe is part of deliverability, not an afterthought
One more piece, and it belongs in this post precisely because of the deliverability section above.
Google and Yahoo now require bulk senders to offer a working, one-click unsubscribe.
An email without one is an email asking to be marked as spam, and every spam mark chips away at the domain reputation you have been carefully protecting.
So the system treats unsubscribe as a first-class event. Every email your emails agent sends carries an unsubscribe link.
One click, no forms, no "manage your preferences" maze: the person lands on a short confirmation page, and their contact record in the CRM is marked as opted out.
From that moment, the contact-pull that builds your newsletter audience quietly filters them out. You cannot accidentally email someone who asked you to stop, because the list itself no longer contains them.
There is a resubscribe path too, the same mechanism in reverse, for the person who opted out in a hurry and wants back in.
The quiet benefit: a clean list of people who actually want your emails is itself a deliverability asset. Senders with low complaint rates land in inboxes.
The unsubscribe link is not a leak in your list; it is the valve that keeps the rest of it healthy.
The takeaway
Events fire whether or not you use them.
Start free: a sheet, a script, your own Gmail. Let the same events carry you to a dedicated platform when the volume asks for it.
The bell was ringing all along. Now something answers it.
Next up: turning your website content into your receptionist's brain.