My organization is having an issue with email replies. The issue is mostly isolated to a few other domains, but doesn't happen all the time with those domains. We are running Exchange 2003 on Server 2003. The issue is that a user here sends an email to the other domain. They get a reply back. They then do a reply all and then some of the outbound emails are returned. What is happening is that the inbound email contains incorrect addressing information so that when they hit reply to all, the addresses are incorrect. What we see is like this: 1) Email send to someone@somedomain.com. 2) Reply to all from someone@somedomain.com comes back. 3) Reply all goes out to someone@some.domain.co.m or replies go out to someone@som and one to eone.com - not all email addresses are corrupted though Not sure where to begin troubleshooting this because I can't tell at which point the email addresses are changed.