Someone hit my site over the weekend using the following search phrase:
   i have emails which repeatedly continue arriving in my inbox the same “ones over” and over and over again why

Aside from the weird use of quotes, can’t you just feel the desperation in that search?  I think it’s the pathos of the “over and over again why” part that puts it over the top (kind of reminds me of “When will the hurting stop?” [*]).

Anyhow, to answer the question, either you have been targeted by a particularly annoying spammer, or there is a problem with your email program.  I have seen this problem at times with Thunderbird using POP3 when you leave the email on the server and your system is experiencing intermittent network problems as well as insufficient memory.  This was with an old laptop that had insufficient memory and was getting bogged down by a nightly virus scan.  Adding more memory fixed the nightly network problems and I haven’t seen the issue since.