To effectively manage cache in email marketing, consider the following best practices:
Unique Image URLs: Use unique URLs for images in each email campaign. This can help avoid serving cached images and ensure accurate open rate tracking. Parameter Strings: Append parameter strings to image URLs to create unique requests. For example, adding a timestamp or a unique identifier can help bypass cache. Cache-Control Headers: Utilize cache-control headers in your email headers to specify how long content should be cached or to prevent caching altogether. Testing: Test your emails across different email clients and devices to understand how cache affects your campaigns and adjust your strategies accordingly.