How to Send Gmail Lead Alerts to Slack with Power Automate

make.powerautomate.com > My flows > + New flow > Automated cloud flow

Open Power Automate and create an Automated cloud flow

Go to make.powerautomate.com and sign in with your Microsoft account. In the left sidebar click 'My flows', then click '+ New flow' at the top. Select 'Automated cloud flow' from the dropdown — this is the event-triggered type, which fires the moment Gmail receives a matching email rather than on a schedule. Give the flow a name like 'Gmail Priority Lead → Slack'.

1. 1Navigate to make.powerautomate.com and sign in
2. 2Click 'My flows' in the left sidebar
3. 3Click '+ New flow' at the top of the page
4. 4Select 'Automated cloud flow' from the dropdown menu
5. 5Enter a flow name and click 'Skip' on the trigger picker (you'll set it in the next step)

Flow canvas > Trigger block > Search 'Gmail' > When a new email arrives (V3)

Add the Gmail 'When a new email arrives' trigger

Click the trigger block on the canvas. In the search bar type 'Gmail' and select the Gmail connector. Choose the trigger 'When a new email arrives (V3)' — use V3, not the legacy V2, because V3 supports label filtering which you need to isolate priority leads. You'll be prompted to sign in to your Google account to create a Gmail Connection.

1. 1Click the empty trigger block on the canvas
2. 2Type 'Gmail' in the connector search bar
3. 3Click the Gmail connector icon
4. 4Select 'When a new email arrives (V3)' from the trigger list
5. 5Click 'Sign in' and complete the Google OAuth flow in the popup window

Flow canvas > Gmail trigger block > Label / To / Include Attachments fields

Configure the trigger to filter for priority emails

With the Gmail trigger open, set the 'Label' field to the Gmail label you use to mark priority prospects — for example, 'Prospects' or 'High-Priority'. Set 'Include Attachments' to No unless your team needs them. Set 'To' to your shared sales inbox address if you only want emails to that specific address. Leave 'From' blank here — you'll filter sender domains in a later step using a Condition action so you can handle multiple domains.

1. 1Click the 'Label' dropdown and select your priority label (e.g. 'Prospects')
2. 2Set 'Include Attachments' to 'No'
3. 3Enter the shared inbox address in the 'To' field if applicable
4. 4Leave 'From' blank — domain filtering happens in Step 5
5. 5Click outside the trigger block to collapse it

Flow canvas > + New step > Data Operation > Compose

Add a Compose action to build the email body preview

Click '+ New step' below the trigger. Search for 'Compose' and select the 'Compose' action under the Data Operation connector. In the Inputs field, use the expression editor to truncate the email body to 300 characters. This prevents Slack messages from becoming unreadably long. Click 'Expression' in the dynamic content panel and enter the formula shown in the pro_tip_code section below.

1. 1Click '+ New step'
2. 2Type 'Compose' in the search bar
3. 3Select 'Compose' under the 'Data Operation' connector
4. 4Click inside the 'Inputs' field
5. 5Click 'Expression' tab in the dynamic content popup
6. 6Enter: substring(triggerBody()?['Body'], 0, 300)

Flow canvas > + New step > Control > Condition

Add a Condition to filter by sender domain

Click '+ New step' and search for 'Condition'. Select the 'Condition' control action. This step prevents internal emails or newsletters from triggering Slack alerts. In the left value field, click 'Expression' and enter the formula: contains(triggerBody()?['From'], '@yourprospectdomain.com'). Set the operator to 'is equal to' and the right value to 'true'. Repeat this pattern for additional domains by adding 'Or' rows.

1. 1Click '+ New step'
2. 2Search for 'Condition' and select it under the Control connector
3. 3Click the left value field, then click 'Expression'
4. 4Enter: contains(triggerBody()?['From'], '@prospect-domain.com')
5. 5Set the middle operator dropdown to 'is equal to'
6. 6Set the right value to: true
7. 7Click '+ Add' > 'Add row' to add additional allowed domains with 'Or' logic

Flow canvas > Condition > If yes > Add an action > Slack > Post message (V2)

Connect Slack inside the 'If yes' branch

Inside the 'If yes' branch of the Condition, click 'Add an action'. Search for 'Slack' and select the Slack connector. Choose the action 'Post message (V2)'. You'll be prompted to create a Slack Connection — click 'Sign in' and authorize via Slack OAuth. Make sure you authorize the correct Slack workspace where your #sales-leads channel lives.

1. 1Click 'Add an action' inside the 'If yes' branch
2. 2Type 'Slack' in the search bar
3. 3Select the Slack connector
4. 4Choose 'Post message (V2)'
5. 5Click 'Sign in' and complete the Slack OAuth authorization
6. 6Confirm the correct workspace is selected in the OAuth screen

Flow canvas > Slack > Post message (V2) > Channel Name / Message Text / Bot Name

Configure the Slack message with email details

With the Slack 'Post message (V2)' action open, set the Channel Name to your target channel — for example, #sales-leads. In the Message Text field, build the notification using dynamic content from the Gmail trigger and the Compose output. Use the format below to include sender, subject, and preview. Click 'Show advanced options' to set the Bot Name field to something recognizable like 'Lead Alert Bot' so reps know at a glance what triggered the message.

1. 1Click the 'Channel Name' field and select or type your channel (e.g. #sales-leads)
2. 2Click inside the 'Message Text' field
3. 3Type '*New Lead Email* from ' then select 'From' from the Gmail dynamic content panel
4. 4Press Enter, type '*Subject:* ' then select 'Subject' from dynamic content
5. 5Press Enter, type '*Preview:* ' then select 'Outputs' from the Compose action (your 300-char preview)
6. 6Click 'Show advanced options' and set Bot Name to 'Lead Alert Bot'

Flow canvas > Slack > Post message (V2) > Message Text > Expression editor

Add a direct reply link to the Gmail thread

Still inside the Slack message configuration, add a final line to the Message Text field that includes a direct link to the Gmail thread. This saves reps 30+ seconds of searching. In the message text, add a new line and type 'Open in Gmail: ' then click 'Expression' and enter the formula: concat('https://mail.google.com/mail/u/0/#inbox/', triggerBody()?['Id']). This constructs the direct thread URL using the Gmail message ID from the trigger.

1. 1Click at the end of the Message Text field and press Enter
2. 2Type 'Open in Gmail: '
3. 3Click 'Expression' in the dynamic content panel
4. 4Enter: concat('https://mail.google.com/mail/u/0/#inbox/', triggerBody()?['Id'])
5. 5Click 'OK' to insert the expression as a token

Flow canvas > Condition > If no > Add an action > Control > Terminate

Add a 'Do nothing' action in the 'If no' branch

Click 'Add an action' inside the 'If no' branch of the Condition. Search for 'Terminate' under the Control connector and select it. Set Status to 'Succeeded'. This tells Power Automate to exit cleanly when an email doesn't match your domain filter rather than treating the run as failed. Without this, your run history will be cluttered with ambiguous incomplete runs.

1. 1Click 'Add an action' inside the 'If no' branch
2. 2Search for 'Terminate' and select it under the Control connector
3. 3Set the 'Status' dropdown to 'Succeeded'
4. 4Leave Comment blank

Flow canvas > Save > Test > Manually

Save and test the flow with a real email

Click 'Save' in the top toolbar. Once saved, click 'Test' in the top right and select 'Manually' — this lets you trigger a test by sending a real email to the monitored inbox. Send a test email from one of your approved prospect domains to the Gmail inbox with your priority label applied. Power Automate will poll Gmail and pick it up within 1-3 minutes.

1. 1Click 'Save' in the top toolbar and wait for the save confirmation
2. 2Click 'Test' in the top right corner
3. 3Select 'Manually' and click 'Test'
4. 4Open Gmail and send a test email from an approved domain to the monitored inbox
5. 5Apply your priority label to the test email in Gmail
6. 6Return to Power Automate and watch the test run progress in real time

make.powerautomate.com > My flows > [Flow name] > 28 day run history

Turn the flow on and monitor the first 24 hours

After a successful test, click 'Turn on' if the flow isn't already active. Go to 'My flows' and click into this flow to access the '28 day run history' panel on the right. Check it after the first few real emails arrive to confirm the Condition is routing correctly and Slack messages look right. Adjust the Message Text formatting or domain filter as needed — you can edit a live flow and save without turning it off.

1. 1Click 'Turn on' in the flow toolbar if status shows 'Off'
2. 2Navigate to 'My flows' in the left sidebar
3. 3Click your flow name to open the flow detail page
4. 4Scroll to the '28 day run history' section on the right panel
5. 5Click individual run entries to inspect input/output values for each step

Paste this expression into the Compose action's Inputs field (Step 4) using the Expression editor. It strips common HTML tags from the Gmail body before truncating to 300 characters, so your Slack preview shows clean readable text instead of raw markup. The replace() calls chain together to remove the most frequent offenders from Gmail's HTML output.

replace(
  replace(
    replace(

replace(
  replace(
    replace(
      replace(
        replace(
          substring(triggerBody()?['Body'], 0, 500),
          '<div>', ''
        ),
        '</div>', ''
      ),
      '<p>', ''
    ),
    '</p>', ' '
  ),
  '<br>', ' '
)