Hi, I'd be really grateful to anyone who can solve this one for me. I'm using Outlook 2003 (service pack 2) on Windows XP. Last week it started to refuse to send emails to one particular address. The emails to this person just sat in my outbox, and blocked others from going out as well. I went offline, deleted the email and went back online, and my other emails then went OK (I did not try to email the problem address again at that point). A few days later I tried to email the problem address again. The same thing happened - except with worse results: this time, the two other emails that were in the outbox at the same time also became non-functional. So now I have three addresses to which emails will not go out of my outbox. Has anyone encountered this problem before and know what I can do about it? Thanks for reading this far.