Skip to main content

Hi team, 

I am currently working on the IP warm-up. The IP status is already green, but while performing the warm-up for

Microsoft domains, we are getting Block Bounce errors. We have updated all the DMARC records, and the IP is green. Could you please help me understand why we are still receiving block bounces specifically for Microsoft domains (AOL, Hotmail, Outlook)

 

@* Marketing Cloud Engagement *

  

 

#Email  #Email Marketing  #Marketing Cloud Engagement  #Email IP Addresses  #Bounce Emails  #Marketing  #Trailhead Challenges

3 comments
  1. Sep 28, 2025, 11:16 AM

    During IP warmup, it is common to get block bounces, this is because the IP is new and you are gradually building its reputation and these usually go away on their own as you proceed with IP warming. But however, if they don’t, then you can submit IP mitigation request to Microsoft directly or raise a case with Salesforce support. (monitor the volume you send to these domains, split the audience and send to engaged subscribers only) You can continue to send emails and following best sending practices.

    Attaching IP warmup guide for quick reference:

    https://help.salesforce.com/s/articleView?id=mktg.mc_es_ip_address_warming.htm&type=5
0/9000