Hi,
I get the same problem with Outlook XP. The solution is:
This issue was reported with Microsoft Outlook XP and occurs when the "Schedule automatic send/receive" checkbox is disabled.
Enable the "Schedule automatic send/receive" option to allow emails sent from Maximizer to be delivered:
1. Open Outlook XP.
2. Click Tools > Options and select the Mail Setup tab.
3. Click Send/Receive.
4. Enable the "Schedule automatic send/receive" checkbox found in the "When Outlook is Online" section. Click OK to save changes.