There are a few reasons for this problem if only some employees are not receiving notifications in their inbox:
Emails from [email protected] have been marked as spam. Ask your IT to whitelist this address or do a google search on how to whitelist for your email provider.
The email address might be in our impression list. This will happen if the receiver has marked the email as spam and our system has acknowledged it and will not send any more documents to that address. Please raise a new case online and reference the title of this article, so we can investigate further.