TL;DR: When you change your "from" address, it must align with your branded sending domain to stay DMARC-compliant. Misalignment is the most common culprit for post-change deliverability drops.
Full Q&A:
Hello,the domain warm-up has been completed, but after changing the sender, the open rate is very low. What should I do?
Hello
Make sure that your new sender address aligns correctly with your sending domain.
This requirement is part of the 2024 Gmail/Yahoo guidelines.
In order to be DMARC compliant, the domain in your friendly “from” address must align with the root domain in your branded sending domain.
So, if your branded sending domain is send.kvyodc.com, the root domain would be kvyodc.com. Therefore, using hello@kvyodc.com as your “from” address would align with the root domain.
Be sure to double-check all friendly “from” addresses for alignment in your flow emails and campaigns.

