Why Is One Mail Account 'Off-Line' on my iMac?

[mrlynn]

graylocks wrote:
i have a POP account that does that from time to time. the only solution i've found is to close Mail and reopen. works fine for a while which can be a few hours or a few weeks.

So far I have quit Mail and relaunched it two times. I have also restarted the iMac. No luck.

I have also re-entered the account password, which I changed Friday. It was working yesterday.

What's causing this?

/Mr Lynn