I am running SCO openserver 6 with sendmail as my mta I have a customer that sends me mail and occasionally some of them get bounced by my machine with a too many hops error. the header shows that it hops around their servers several times before getting to me and I know this is something that they should fix. but they will not and are telling me I need to fix it. they are a large customer and we do not want to lose them over something so trivial. the question is what can I do on my side to assure that I don't bounce there mails for too many hops?