we have an in house exchange server connected on 22.214.171.124 we suddenly are not getting about 50% of our sent e-mails though to the end users. sometimes we get a delayed message or soetimes a bounceback with odd refused messages like this one:
smtp;554 EMail from mailserver at 126.96.36.199 is refused. See http://spamblock.outblaze.com/188.8.131.52
Its odd because we dont own or use the ip address 184.108.40.206
any idea what could be causeing this? we have checked our ip aagainst sites like spamhause and its clear.