Factors for deciding sender of mass email (who it's "from")
I'm looking for some insight into best practices when deciding what email to use as the sender of a bulk email. We do not use subdomains, but have our DNS/DKIM/DMARK set up and send everything from different firstname.lastname@example.org email addresses.
When also considering a recipient's contact list and inbox preferences, are there best practices that I should reference in deciding the "from" email? For example, if we send an email from email@example.com vs. firstname.lastname@example.org a user's ESP may filter these differently if they're already in the recipient's contact list.
I'm curious regarding deliverability and also inbox treatment when using different sender emails under the same domain. Your feedback is greatly appreciated!