Yep, it is possible I guess if they dont have much bandwidth and someone is pushing a shit load of mail through there. If they are spamming from your server, then they may not have the mail servers configured properly to prohibit relaying. Either way things can be done to solve the problem, but you gotta get them to do it.
If they are spamming from 1 box and supposedly using 30 other boxes resources then no, it can only affect your box if it is coming from there, or the bandwidth limitations from sending out too much mail.
Andy
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