What does it mean if it keeps asking for my '.mac' password? It cannot receive mail, only send. Carolina.rr account is working. Went into mail preferences, checked everything out - finally even changed the password to make sure I had the right one. Turned the computer on & off a bunch of times too.

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When dealing with email you need to consider the incoming and outgoing server settings. Some email providers don’t allow sending other email through their servers. This is a pain in 10.4 and earlier but has been addressed in 10.5. Each email server has a port that it uses and some email services block traffic on one port but will allow traffic on another.

Road Runner generally doesn’t block traffic. Bellsouth does however. Ugh. But is sounds more like you need to check to make sure that your email’s outgoing server is selected correctly.

In your mail.app preferences, be sure to check the box to “only use selected server”. Then check to make sure that the .mac outgoing port is 25/587. You can find this under (edit server settings) in the pull down window of the server list.

Now it could be possible also that your password is invalid. Be sure to check that out at www.me.com by logging into your mobileme account.