How to disable Outlook, Yahoo Auto-Complete

Here are the steps to remove entries from the AutoComplete cache

  • Open a new email message.
  • Type the first few characters of the AutoComplete entry that you want to remove.
  • When the entry appears in the list of suggested names, move your mouse pointer over the name until it becomes highlighted, but do not click the name.
  • When the “X” icon appears next to the highlighted name, click X to remove the name from the list, or press the Delete key on the keyboard.

To disable AutoComplete or clear your AutoComplete completely in Outlook.

In Outlook 2010 - 2016, follow the steps below to have this completely disabled. This is a sort of required in order not to send an email to a wrong recipient.

- click the File menu and 
- select Options.
- In the Outlook Options window click the Mail tab.
- Scroll down to Send messages. 
- Uncheck the Use Auto-Complete List to suggest names when typing in the To, Cc, and Bcc lines box.

Note: To clear the AutoComplete list, simply click the Empty AutoComplete List button. You’ll see a confirmation window about clearing the AutoComplete list, click Yes.

Outlook AutoComplete should be completely disabled and any history that was in the auto-complete list should be completely erased (if you clicked the clear autocomplete button).

How to forcefully kill a program in Windows

Run the following command with the relevant switches as stated below, the enter the PID.
– This can be found from the Task Manager

taskkill /f /pid [PID]

What to know when an IP (domain) has been Blacklisted.

When a specific domain or IP is blacklisted internally, there is a possibility that this is propagated to third-party blocklist (blacklist).

And this record takes time to update and can take up to 48 hours. As soon as you have removed the IP (domain) internally, The third blocklist (the record still needs to be updated and this can take some time to update).

Note: A lot of mail servers work this way (e.g, Exchange Online Protection).