My mail won't send! I'm getting an error mentioning some type of blacklist or blockli

[Jim]

My mail won't send! I'm getting an error mentioning some type of blacklist or blocklist
Your IP (your ISP) is listed as a source of spam and on a blocklist as a result they will need to contact their ISP to get the IP unblocked. In the meantime putting their ISP SMTP mail settings in their mail reader's outgoing (SMTP) setting may fix the problem.

[rosaire]

I have the same problem with all my customer that I host on my virtuel server. All email are not working since the new spam and virus filter are install