Mailing Alerts allow you to automatically monitor the performance of sent mailings and receive notifications when specific thresholds are exceeded.

This feature is useful for quickly identifying potential delivery issues such as high bounce rates, low engagement, or abnormal unsubscribe activity.

Once enabled, PostUp will review the performance of a mailing after a specified period of time and send a warning email if any configured thresholds are triggered.

How Mailing Alerts Work

Mailing Alerts monitor selected performance metrics after a mailing has been sent. If the mailing exceeds a configured threshold, a warning notification is sent to the specified email addresses.

Typical use cases include:

• Detecting unusually high bounce rates

• Identifying delivery issues early

• Monitoring abnormal unsubscribe activity

• Flagging mailings with unusually low engagement

Enabling Mailing Alerts

1. Navigate to the Mailing Alerts settings page.

2. Select Check Mailing Delivery Statistics and Issue Warnings.

3. Configure the monitoring criteria described below.

Mailing Monitoring Settings

Check Mailings After

Defines how long PostUp should wait after a mailing is sent before evaluating its performance.

Example:

• 2 hours allows enough time for delivery and engagement activity to occur before analysis.

Minimum Size of Mailings to Check

Specifies the minimum number of recipients a mailing must have before alerts are evaluated.

This prevents alerts from being triggered by very small test mailings.

Example:

• Setting 500 recipients ensures alerts are only evaluated for larger sends.

Warning Thresholds

You can configure alert thresholds for various delivery and engagement metrics. If a mailing exceeds or falls below the configured value, a warning will be generated.

Message Failures

Triggers an alert if the percentage of messages that fail to send exceeds the defined limit.

Example:

• Alert if more than 2% of messages fail.

Unsent Messages

Triggers an alert when messages remain unsent beyond the expected delivery process.

Total Bounces

Triggers an alert if the overall bounce rate exceeds the specified threshold.

Total bounces include:

• Hard bounces

• Soft bounces

• Block bounces

Hard Bounces

Triggers an alert when permanent delivery failures exceed the configured percentage.

Examples of hard bounce causes include:

• Invalid email addresses

• Non-existent domains

Soft Bounces

Triggers an alert when temporary delivery failures exceed the configured threshold.

Examples include:

• Temporary server issues

• Mailbox full

Block Bounces

Triggers an alert when receiving servers reject the message.

These often indicate filtering or reputation issues.

Unsubscribes

Triggers an alert if the unsubscribe rate exceeds the configured percentage.

High unsubscribe rates may indicate:

• Messaging misalignment

• List fatigue

• Audience targeting issues

Optouts

Triggers an alert when the number of recipients opting out exceeds the defined threshold.

Opens

Triggers an alert if the open rate falls below the configured percentage.

Low open rates may indicate:

• Subject line issues

• Deliverability problems

• Audience targeting concerns

Clicks

Triggers an alert if the click rate falls below the defined threshold.

This helps identify mailings that may not be generating expected engagement.

Notification Settings

Send Warnings To These Email Addresses

Enter one or more email addresses to receive alert notifications.

Multiple addresses can be added by separating them with commas.

Example:

marketing@company.com, deliverability@company.com

Best Practices

To get the most value from Mailing Alerts:

• Configure alerts only for metrics that are meaningful for your program
• Set thresholds based on historical performance
• Use alerts as early indicators of deliverability or engagement issues

Most organizations monitor:

• Bounce rates

• Unsubscribe rates

• Open rate thresholds

• Click rate thresholds