ventura

Howdy, Wife has mentioned she's been having a problem emailing certain people for the past month. Today I got to look at the problem (she only mentioned it to me yesterday) and the summary is that 208.76.80.176 is being blacklisted by some ISP's as being a spam source. From RR. and from Verizon How does this happen and how can it be fixed? This is a TCH machine right?