As already mentioned, email is a key communication tool we all use daily.  And there is much frustration when you are waiting for an email to arrive and it just doesn’t come through. It’s always worth checking your “Spam” or “Junk” email folders first in case the message has been tagged in some way as possible rubbish but still delivered; messages in there can then be marked as “Not Spam” as required.  Some systems we provide will provide a higher-level of external Spam protection which again could be blocking genuine messages from getting through so it is worth checking with us to see if this is the case.  We can then whitelist the message and allow it through.  If neither of the above are helping, you could talk to the sender to see if they are getting any bounceback that could help with identifying where the issue is as we can then use this information to try and open the delivery path.