Summary An incoming email file attachment name contains the same character repeated many times.
Some email clients are susceptible to buffer overflows which are caused by sending long file names.
In this case, the same character has been repeated many times within a file name. This is often an indicator of a buffer overflow attempt. Buffer overflows More about this general class of attacks, which is the root cause of many attacks on the Internet. Other POP3 exploits parametric information filename The beginning portion of the filename. The number of repeated characters to trigger this detection.