Mail tries to check all accounts at once - "server could no be connected"

Question

Hello,
i will try to explane this in english:
With Leopard and all the cats before Mail was checking my 15 accounts one after another. With Snow Leo Mail tries to check all accounts at the same time (u can see which account is check at the spinning symbol after the account name).
Now, when all accounts are check at once, minimum 3-5 account alert an error "the server could no be connected". Everytime i click on Receive different account loose the server connection.
Can i do something for mail checking my accounts step by step like Leo did?

Answer 1

Glad I found that there is at least one other person who seems to have the same problem checking for mail. I get the following annoyingly frequently and haven't found a solution:
"There may be a problem with the mail server or network. Verify the settings for account “user@xxxxxx” or try again.
The server returned the error: The connection to the server “mail.xxxxxx.ca” on port 110 timed out."
Could this be because Mail under SL no longer checks one email after another causing a network congestion?
Also since upgrading to OS 10.6 I have problems loading several webpages at once, which usually results in page-time-out messages.
I have checked the following: bypassing router, opening firewall, ports, changing network and internet settings with IPNetTunerX to previous OS values, but nothing helps so far.
I suspect nobody knows how to change Mail back to the previous 'mail-by-mail' checking which would help with the time-out issues.
I keep digging and hope someone else has suggestions what we could try.