> For the complete documentation index, see [llms.txt](https://kasplo.gitbook.io/kasplo-doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kasplo.gitbook.io/kasplo-doc/product-docs/overview/integrations/kasplo-integration-with-zapier.md).

# Kasplo Integration with Zapier

### Send Emails with Kasplo SMTP

Follow the steps below to configure Kasplo SMTP in Zapier:

#### Step 1: Add an Action in Zapier

* In your Zap, click on the Action step or the + (plus icon) to add a new action.
* A dialog box will open.

#### Step 2: Choose SMTP by Zapier

* In the search box, type SMTP.
* Select SMTP by Zapier.
* The right sidebar will open with the setup options.

#### Step 3: Select Action Event

* Click on the Action Event dropdown.
* Select Send Email.

#### Step 4: Connect Kasplo SMTP Account

* Click Sign In.
* A new window/tab will open where you need to enter your Kasplo SMTP credentials.

**Fill in the following details:**

* **Host:** smtp.kasplo.com (or your assigned Kasplo SMTP host)
* **Username:** Your Kasplo SMTP username
* **Password:** Your Kasplo SMTP password
* **Port:** 587 (recommended)
* **From Email:** Your verified sender email in Kasplo

**After entering the details:**

* Click Yes, Continue to SMTP by Zapier

#### Step 5: Configure Email Details

* **To:** Enter recipient email address(es) (up to 5 allowed)
* **Subject:** Enter your email subject line
* **HTML Body:** Add your email content in HTML format
* **Plain Text Body:** Provide a fallback text version

#### Step 6: Optional Fields (If Needed)

You can also configure:

* CC / BCC
* Reply-To address
* Attachments
* Custom headers (if required)

#### Step 7: Test the Action

* Click Continue
* Then click Test Step to send a test email

**Test Results:**

* Data In: Shows the input values you configured
* Data Out: Confirms if the email was successfully sent

#### Step 8: Publish Your Zap

* If everything works correctly, click Turn On Zap
* Your automation will now send emails via Kasplo SMTP

{% hint style="warning" %}

### Important Notes

* Ensure your sender email is verified in Kasplo
* Use correct SMTP credentials provided by Kasplo
* If you encounter an error like “503 5.5.1 RCPT”, it usually means that the recipient email address is missing, empty, or invalid.

**How to Fix**

* Verify that the “To” field contains a valid email address
* Check your trigger test data in Zapier to ensure it includes a proper email value
* Review your Zap History to identify where the email field may be empty
* Update your Zap configuration if required

Ensuring a valid recipient email address will resolve this issue in most cases.
{% endhint %}