Ok thanks. I see here what deferred means:
- Deferred: the transactional email is in Standby Reception and can be received later (e.g. full inbox)
Meaning that for some of your recipients, the email is in standby mode.
I checked your account, it seems like for older campaigns, you don’t have deferred emails any more, so maybe is it just a matter of a few days before all your recipients receive the email?