[jcrites]

Sorry, to clarify, I only mean this particular type of transactional email: password reset, MFA.

But even for other types of transactional emails, like shipment confirmations, I would expect the open rate to be much higher and/or the complaint rate to be much lower than for marketing email.

[josephg]

It’s also not a bad idea to provide an unsubscribe option for shipment updates.