I have a strange problem when sending email to my cousin through Thunderbird. I get an error that says the user is unknown. However when I send him email through the Webmail interface or if I use my GMAIL account I have no problem. I have Thunderbird setup to go through my domain on Dreamhost.
Does anybody have any clue what could be the problem. I contacted Dreamhost about it, but they couldn’t seem to pinpoint the problem.