I recently used the preview text hack in an A/B test for a weekly newsletter. The test case that used this hack received a pretty significant number of bounces compared to the test case without it. I'm curious to see if anyone else ran into similar issues.

Has anyone tried this hack before? If so, what were your results?

Article about the preview text hack: https://litmus.com/blog/the-little-known-preview-text-hack-you-may-want-to-use-in-every-email