GMass sends cold outreach and mail merges from Gmail. FlowMattic posts what recipients do next to Slack: a reply to answer, a click on your pricing link, a bounce that hurts your sender reputation, an unsubscribe to respect. Sales reps, founders and agencies running campaigns see the signals that need a person without watching the GMass reports.
6 triggers 14 actions 6 example workflows 2 ready-made templates Unlimited runs
When this happens in GMass6 triggers
Do this in Slack14 actions
1. TriggerEmail Opened2. ActionSend Channel MessageWhen GMass fires Email Opened, 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.
Ready-made templateOpens show which campaigns people are reading. Posting them gives the team a feel for subject lines that work while the campaign is still sending.
Email OpenedSend Channel Message
View the template A reply is the one signal that needs a human. The rep who owns the campaign gets a direct message with the prospect and subject, so the answer goes out today.
Email RepliedFind User by EmailSend Direct Message
A Filter keeps only clicks on the links that show buying intent, such as pricing or a calendar page, and posts them to the sales channel for a timely follow-up.
Email ClickedFilterSend Channel Message
Bounced emails post to a deliverability channel, so whoever owns the list can clean bad addresses before a high bounce rate hurts the next campaign.
Email BouncedSend Private Channel Message
Each unsubscribe posts to the sales channel, so reps know not to follow up manually from their own inbox with someone who opted out.
Email UnsubscribedSend Channel Message
A Counter tracks opens and a Filter continues once a prospect has opened several times, then Slack sets the rep a reminder to call or send a personal note.
Email OpenedCounterFilterAdd Reminder
At the end, each open on your GMass campaigns is posted to your outreach channel with the recipient and campaign subject.
Open Connects in FlowMattic and add Slack with the account that will post outreach updates.
Create a workflow with the GMass Email Opened trigger and follow the instructions shown to connect your GMass account.
Send a small test campaign to yourself and open it, so FlowMattic captures the open fields.
Add Send Channel Message, choose the channel and map the recipient email and subject. Test the step and switch it on.
1. Trigger in GMass
Email Opened
2. Action in Slack
Send Channel Message
Fields mapped from the earlier steps (a typical setup)
| From GMass | To Slack |
|---|---|
| Recipient email | Message: prospect |
| Campaign subject | Message: campaign |
| Open time | Message: opened |
A trigger starts a workflow. An action is something FlowMattic does in the app as a step.
GMass and Slack connect through FlowMattic on your own site, with no separate automation account in the middle and no charge per run.
Direct messages to the rep who owns the campaign mean a warm reply does not wait in a shared inbox.
Bounces and unsubscribes posted to Slack let you clean the list before the next send, not after the damage is done.
FlowMattic runs on your WordPress site with unlimited runs, so a large campaign's opens and clicks cost nothing extra to post.
Connect Slack in FlowMattic, start a workflow with a GMass trigger such as Email Opened or Email Replied, and add Send Channel Message. Map the recipient and subject, test it with a real event and switch it on.
Yes, when the reply data includes the sending account's email. Find User by Email looks the rep up in Slack and Send Direct Message sends the reply alert to them.
Email Replied for conversations and Email Clicked for interest in a specific link. Opens are useful for campaign reporting, but they are less reliable as a sign of intent.
Yes. Use Send Private Channel Message in the workflow that starts from Email Bounced, so list-quality alerts stay with the people who manage the list.
Did not find your answer? You can browse the help center or ask us directly.
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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. GMass integration 1.0.0, Slack integration 1.0.
