for the last month or so, it seems that certain emails just don't seem to arrive to my mailbox. These are work-related emails, and would be extremely important to receive. I tried to email myself from my gmail account, it worked properly, so it really seems that it is not a constant problem. I have found one of the missing mails in the spam section (don't know why), but the rest are missing entirely.  

Can you please help me? I can't figure out what the source of the problem could be. 

Thanks a lot :)