We've seen that our Tech team has been in touch.
There's an issue with your Outlook 2007 email client as it's not saving the settings that you keep on putting in it. Your TPG email account is working fine as you said that you can send bulk emails using our webmail "Post office".
You may need to uninstall and reinstall your Outlook 2007 client, or install a new email client instead. But first, make sure that you'll backup your important mails and contacts.
Let us know should you require further assistance.
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