Missing emails

Just recently I am not receiving some emails.   I have EM Client on my home PC and Blue Mail on my Samsung phone.    I am receiving emails via Blue Mail, but now realise I am missing some emails on my EM Client.   3 emails have just come through via Blue Mail and I am pressing refresh on EM Client and it states the current time it was refreshed, but still the 3 emails have not come through.  I have checked Junk and Spam mail, but nothing - what has happened to my missing emails???   thanks