Troubleshoot messages not being sent with the ActiveCampaign <> Postmark CX App

If you’re seeing delays or messages not being sent when using Postmark with ActiveCampaign, this guide will help you identify and resolve common causes.

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Step 1. Confirm your Postmark connection in ActiveCampaign

First, make sure your ActiveCampaign account is correctly connected to your Postmark account.

1. In ActiveCampaign, go to Apps → Postmark.

2. Check that your Postmark account appears under the Send a transactional email step.

If you don’t see your account listed, click Add new account, then sign in with your Postmark credentials and select your server.

Also confirm that the From address in the message settings is a verified sender in Postmark. Messages will fail to send if the address isn’t approved.

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Step 2. Check your Postmark account

If your integration looks correct, log in to your Postmark account and confirm:

• Your account has been approved for sending.

• You have sufficient credits available.

• Your payment method is up to date and not declined.

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Step 3. Review links in your ActiveCampaign email

If your email template contains links with multiple “%” symbols, ActiveCampaign may interpret these as personalization variables. This can prevent the message from sending.

If you’re using links with encoded characters (for example, URLs copied from analytics tools), try replacing them with simpler links and test again.

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Step 4. Test with a simple automation

To confirm that the integration itself is working correctly, we recommend setting up a minimal automation for testing:

1. Create a test tag.
   Go to a contact record and add a new tag called test.

2. Create a new automation.

3. Set the trigger to “Tag is added” → test.

4. Add an action to “Send a transactional email” using your connected Postmark account.
   Use a simple plain-text message with no images, links, or special characters.

5. Create a test contact (for example, postmarktesting@gmail.com) and apply the tag test to it.
   This should trigger the automation.

If the message arrives, your connection is working. If it doesn’t, continue below.

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Step 5. Share your logs and account details

If your test message hasn’t arrived after at least one hour, please share:

• Your ActiveHosted username (found in your ActiveCampaign account URL: https://[youraccount].activehosted.com)

• A screenshot or copy of your Postmark logs from Apps → Postmark → View logs

Once we have those details, we can investigate further with ActiveCampaign’s engineering team to see if there are internal queue delays or errors.

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Step 6. If your ActiveCampaign logs show an “Error”

If your Postmark logs within ActiveCampaign show an Error, please:

1. Copy the exact error message.

2. Include the automation name where it occurred.

3. Share your ActiveHosted username.

We’ll work with ActiveCampaign to review internal logs and identify the issue.
Common causes include using a “From” address that’s no longer verified in Postmark.

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Understanding delays (the automation queue)

In most cases, messages should send within a few minutes. However, ActiveCampaign’s system may occasionally delay messages for up to 15–60 minutes before passing them to Postmark for delivery.

If delays exceed an hour, please contact us so we can review your specific case with ActiveCampaign’s team.

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Summary

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Need help?
If you’ve completed these steps and your messages still aren’t sending, contact Postmark Support at https://postmarkapp.com/support and include your test details, screenshots, and account info.

We’ll coordinate with ActiveCampaign to identify and resolve the issue as quickly as possible.