What happens on your MailerLite list is useful to more people than whoever runs the newsletter. FlowMattic posts the list events you choose to Slack: new form sign-ups, sent campaigns, complaints and people who finish an onboarding automation. It suits creators, small marketing teams and SaaS companies whose sales or support staff live in Slack.
10 triggers 22 actions 7 example workflows 2 ready-made templates Unlimited runs
When this happens in MailerLite10 triggers
Do this in Slack14 actions
1. TriggerSubscriber Added Through Form2. ActionSend Channel MessageWhen MailerLite fires Subscriber Added Through Form, FlowMattic runs Send Channel Message in Slack with the data from that event.
You build this in the FlowMattic workflow builder on your own site. See the setup steps
Each one uses only triggers and actions the two integrations ship today, plus FlowMattic's own tools. Where the library has a ready-made template, import it instead of building from scratch.
Subscriber Added Through Form posts the new subscriber's email and the form name to #signups, so the team sees which landing pages are bringing people in.
Subscriber Added Through FormSend Channel Message
Campaign Sent posts the campaign name to #marketing, so support is ready for replies and sales can mention the offer on their calls.
Campaign SentSend Channel Message
Complaints affect whether your emails reach inboxes at all. Each one is posted to a private channel with the address, so the list owner can look at where that person signed up.
Spam ComplaintSend Private Channel Message
Subscriber Completed Automation fires at the end of the workflow you pick. A message to #sales with the email means someone can follow up while the product is fresh in their mind.
Subscriber Completed AutomationSend Channel Message
A direct message with the address and date keeps the writer close to how readers respond, without anyone checking reports every day.
Subscriber UnsubscribedDate/Time FormatterSend Direct Message
Your own app or checkout sends a webhook for each new account. FlowMattic creates the subscriber, places them in a group and posts the sign-up to Slack in one run.
WebhookCreate or Update SubscriberAdd Subscriber to a GroupSend Channel Message
A Schedule reads the beta group with Get Group Subscribers and posts the list to the product channel, so the team knows who to invite to testing sessions.
ScheduleGet Group SubscribersSend Channel Message
At the end, everyone who joins through a MailerLite form is posted to the Slack channel you choose.
In FlowMattic, open Connects and add your MailerLite account.
Add a Slack connection for your workspace with a user who is in the channel.
Create a workflow with MailerLite and Subscriber Added Through Form, then sign up through one of your forms so FlowMattic captures the data.
Add Slack with Send Channel Message, choose the channel, map the email and form into the text, test it and switch the workflow on.
1. Trigger in MailerLite
Subscriber Added Through Form
2. Action in Slack
Send Channel Message
Fields mapped from the earlier steps (a typical setup)
| From MailerLite | To Slack |
|---|---|
| Subscriber email | Message text |
| Subscriber name | Message text |
| Form name | Message text |
A trigger starts a workflow. An action is something FlowMattic does in the app as a step.
MailerLite and Slack connect through FlowMattic on your own site, with no separate automation account in the middle and no charge per run.
List events go from MailerLite through FlowMattic on your own WordPress site to Slack, not through another company's automation account.
Runs are unlimited, so a launch day with hundreds of sign-ups posts every one without a task allowance to watch.
MailerLite has ten triggers, and Filter and Router decide which ones reach which channel or person.
Any of MailerLite's triggers here: new subscribers, form sign-ups, updates, unsubscribes, group changes, bounces, spam complaints, finished automations and sent campaigns. Each can go to a channel, a private channel or a direct message.
Yes. Start from Schedule instead of a MailerLite trigger, read a group with Get Group Subscribers, and post the result once a day or once a week.
Yes. Add a Filter after Subscriber Added Through Form that continues only when the form name or ID matches the form you care about.
Yes. Subscriber Bounced fires when an address bounces. Posting it to the same private channel as spam complaints gives one place to watch list health.
Posting messages works with the Slack workspace you already use. The connected user must be a member of any private channel you post to.
Did not find your answer? You can browse the help center or ask us directly.
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Slack and Notion17 shared templatesInstall FlowMattic, connect both accounts and import a template. Every run stays on your own server.
30-day money-back guarantee Unlimited workflows and runs Self-hosted
Reviewed 23 Oct 2026. The example workflows are written with AI from the real triggers and actions of both integrations and checked against them. MailerLite integration 1.0.3, Slack integration 1.0.
