Connect Mixmax and Slack

Mixmax tracks what happens after you hit send in Gmail: meetings booked, polls answered, emails opened and unsubscribes. FlowMattic posts confirmed meetings to sales, shares poll votes, warns marketing ops about unsubscribes and DMs the rep when a prospect engages. For sales teams who live in Gmail and Slack and want Mixmax activity where they talk.

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4 triggers 14 actions 5 example workflows 2 ready-made templates Unlimited runs

Try a pairing

When this happens in Mixmax4 triggers

Do this in Slack14 actions

1. TriggerMeeting Invitation Confirmed

2. ActionSend Channel Message

When Mixmax fires Meeting Invitation Confirmed, 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

Mixmax and Slack workflows you can build

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.

Ready-made template

Post confirmed meetings to the sales channel

When a prospect confirms a Mixmax meeting invitation, the meeting and attendee post to the sales channel, so managers see booked meetings as they come in.

Meeting Invitation ConfirmedSend Channel Message

View the template

Remind the rep to prepare before the meeting

Date/Time Formatter works out a time before the meeting and Add Reminder nudges the rep to research the account, so calls start prepared.

Meeting Invitation ConfirmedDate/Time FormatterAdd Reminder

Share poll votes with the team that asked

Mixmax polls in an email ask a quick question, such as which date suits. Each vote posts to the channel, so the team sees the answers add up.

Poll Voted OnSend Channel Message

Warn marketing ops when someone unsubscribes

Unsubscribe clicks post to a private marketing ops channel, so the contact can be removed from other lists and sequences before the next send.

Unsubscribe Link ClickedSend Private Channel Message

DM the rep when a prospect opens their email

The email activity trigger covers several kinds of activity. A Filter keeps opens, Find User by Email finds the sender in Slack, and the DM tells them to follow up.

Email ActivitesFilterFind User by EmailSend Direct Message

Set up: confirmed meetings in Slack

At the end, every confirmed Mixmax meeting posts the attendee and time to your sales channel.

Connect Slack
Add your sales team's Slack workspace under Connects in FlowMattic.
Start with Meeting Invitation Confirmed
Create a workflow with Mixmax and Meeting Invitation Confirmed, then follow the trigger's instructions so Mixmax sends the event to the workflow.
Book a test meeting
Send yourself a Mixmax meeting invite and confirm a slot so FlowMattic captures the fields.
Post to sales
Add Slack Send Channel Message, choose the channel, map the attendee, meeting title, time and rep, test it and switch the workflow on.

Import the ready-made template Beginner, about 5 min to set up

Slack app icon — Built on the FlowMattic canvas. Test each step with real data, then switch the workflow on.

From Mixmax	To Slack
Attendee name	Message: prospect
Attendee email	Message: contact
Meeting title	Message: meeting
Start time	Message: when
Sender email	Message: rep

Triggers and actions in this pair

A trigger starts a workflow. An action is something FlowMattic does in the app as a step.

Good to know

The email activity trigger fires for opens, sends and other activity. Filter on the activity type before posting, or every email a rep sends reaches Slack.
Opens are a rough signal, because some mail apps load tracking images on their own. Use them as a nudge to follow up, not as proof someone read the email.
Find User by Email works when reps use the same email in Mixmax and Slack, which is usually their Gmail address.

Mixmax

Integration page

Triggers (4)

Email ActivitesTriggers for email activities like when email is opened, sent, received, etc.
Poll Voted OnTriggers a vote is captured on a poll.
Unsubscribe Link ClickedTriggers when someone clicks on your unsubscribe link.
Meeting Invitation ConfirmedTriggers when a meeting invitation is confirmed.

Slack

Integration page

Actions (14)

Send Channel MessagePost or Schedule a new message to a specific #channel
Add ReminderAdds a reminder for the user
Create ChannelCreates a new channel
List All ChannelsRetrieve list of all channels
Set Channel TopicSets the topic on a selected channel
Set StatusSets your Slack status to the given text and emoji
Invite User To ChannelInvite an existing User to an existing Channel. You must be a member of the channel to invite someone to it
Find User by EmailFinds a user by matching against their email instead of their username
Find User by IDFinds a user by their ID.
Send Direct MessageSend a direct message to a user or yourself from the Slackbot. Can also schedule a message for later
Send Private Channel MessagePost a new message to a private channel you choose. Can also schedule a message for later
Update ProfileUpdate basic profile fields such as name or title
Find MessageFinds a Slack message using the Slack Search feature
Upload FileUpload file to your slack workplace

Why run this pair with FlowMattic

Mixmax and Slack connect through FlowMattic on your own site, with no separate automation account in the middle and no charge per run.

Booked meetings are visible

Managers and teammates see confirmed meetings in Slack, which helps forecasting and cheers on the rep who booked them.

Reps follow up at the right moment

Engagement DMs reach the sender while the prospect is looking at the email.

Runs on your server

FlowMattic runs on your WordPress site with unlimited runs, so tracking a whole team's emails needs no bigger plan.

Common questions

How do I send Mixmax meetings to Slack?

Create a FlowMattic workflow with the Mixmax Meeting Invitation Confirmed trigger, follow its instructions so Mixmax sends the event to the workflow, then add Slack Send Channel Message with the attendee and time.

Can each rep get their own email activity?

Yes. Start with the Mixmax email activity trigger, Filter on the activity you care about, then use Find User by Email with the sender's address and Send Direct Message.

Can unsubscribes be reported to marketing?

Yes. The Unsubscribe Link Clicked trigger posts to a private marketing ops channel, so someone removes the contact from other lists.

Can poll results be posted?

Yes. Poll Voted On fires for each vote. Post it to the channel of the team that sent the poll, with the voter and their answer.

Will every sent email appear in Slack?

Only if you post email activity without a Filter. Add a Filter on the activity type so only opens or replies are sent.

Did not find your answer? You can browse the help center or ask us directly.

Start automating Mixmax and Slack

Install FlowMattic, connect both accounts and import a template. Every run stays on your own server.

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Reviewed 27 Oct 2026. The example workflows are written with AI from the real triggers and actions of both integrations and checked against them. Mixmax integration 1.0.0, Slack integration 1.0.