▶ Watch related videos on YouTube — Search results for: Resolving high block bounce rates with shared ip in SFMC

Understanding the Issue

When using a shared IP, it is expected to encounter some deliverability challenges, especially during the IP warmup phase. However, a 70% block bounce rate is unusually high. The fact that the issue is specific to Outlook and Hotmail suggests that there might be a problem with the IP’s reputation or the content of the emails being sent.

The root cause of the issue is likely due to the shared IP being used by other clients who may be sending spam or low-quality emails, affecting the IP’s reputation and causing the block bounces.

Possible Solutions

Instead of switching to a dedicated IP, which may not be necessary for a small volume of sends, the focus should be on investigating the reasons behind the block bounces. This can be done by following domain-specific best practices for MS domain and registration for SNDS, which can help track the reputation of the IP and identify any issues.

Additionally, Salesforce Support can be reached out to explore options such as Preemptive Accommodation, which can help alleviate the issue in advance. However, it is essential to check if this option is still supported.

Best Practices

To avoid similar issues in the future, it is crucial to follow best practices for email deliverability, such as:

email-deliverability-best-practices.txt

Monitor IP reputation and sender score
Implement domain-specific best practices for MS domain and registration for SNDS
Use a clear and relevant subject line and email content
Avoid spam triggers and keywords
Use a consistent sending schedule and volume

Heads up: It is essential to note that switching to a dedicated IP may not necessarily resolve the issue, especially if the volume of sends is low. In such cases, it is crucial to focus on improving the overall email deliverability and reputation of the IP.

Checklist

Preventing Block Bounces

• Monitor IP reputation and sender score
• Implement domain-specific best practices for MS domain and registration for SNDS
• Use a clear and relevant subject line and email content
• Avoid spam triggers and keywords
• Use a consistent sending schedule and volume
• Regularly review and update email lists to prevent bounces
• Use authentication methods such as SPF and DKIM

Frequently Asked Questions

What is the minimum volume of sends required for a dedicated IP?

It is generally recommended to have at least 100k sends per month to use a dedicated IP.

Can I use a dedicated IP and a shared IP simultaneously?

No, dedicated IP(s) and shared IP(s) cannot be configured simultaneously on the same Enterprise.

How can I improve my IP reputation?

You can improve your IP reputation by following domain-specific best practices for MS domain and registration for SNDS, using a clear and relevant subject line and email content, and avoiding spam triggers and keywords.

What is Preemptive Accommodation?

Preemptive Accommodation is an option that can help alleviate block bounces in advance by working with Microsoft Support and Salesforce Support.

Can I switch to a dedicated IP to resolve block bounces?

Switching to a dedicated IP may not necessarily resolve the issue, especially if the volume of sends is low. It is crucial to focus on improving the overall email deliverability and reputation of the IP.