Recently I rang a contact to check if they were OK as no reply to several emails. She told me she had noticed that emails were dropping off her phone. I asked if she knew this, why not login to her emails on her tablet - which she did while we had this somewhat weird conversation. Yes, the emails were there. I suggested that as she knew there was a problem with her phone/optus/emails, maybe a good idea to at least check her emails via tablet once a week.

Throwing this experience into the ring just in case useful.