Hi,
We’ve checked to make sure things are not going to spam, those that did receive an email got it directly in the inbox. Those that reported not to have received it, checked spam and reported that the emails were not being flagged as spam.
The domain that the emails are sent from is the same as the one that the blog is installed on.
As far as the host is concerned, there is not a limit for how many emails are sent. The server is set up to whitelist all company email addresses and all subscriber/author/admin emails.