There are several scenarios where notifying your ESP is essential:
Changes in Email Volume: If you anticipate a significant increase or decrease in the number of emails you plan to send, it is vital to notify your ESP. This helps them prepare their infrastructure and avoid any potential issues. New Campaigns or Promotions: When launching a new campaign or promotion, especially during peak seasons like Black Friday or the holidays, informing your ESP can help ensure smooth execution. New IP Addresses or Domains: If you are switching to a new IP address or domain, your ESP needs to know to help with proper IP warming and avoid any deliverability issues. Changes in Content or Audience: Significant changes in email content or targeting a new audience may require adjustments in your email strategy, which your ESP can assist with.