有用的設定

Set-ImapSettings -MaxConnections Value

Set-ImapSettings -MaxConnectionsFromSingleIP Value

Set-ImapSettings -MaxConnectionsPerUser Value

Troubleshot

[1]

Outlook: 正常, 其他 Client (K9Mail) 失敗

Client Side Msg

"NO, LOGIN failed."

Fix

1. Disconnect mailbox

2. Remove User in OU

3. Create User with same name

4. Re-connect to mailbox