When you set up a new account on Gmail to be able to send messages from that account, one of the options to choose from is Treat as an alias. The only documentation I found about the feature is this page, but after reading it, I'm still confused as to what the feature does.
- What exactly does this feature do?
- When would I need to use it?
- What other side effects does this feature have?
- Before this feature existed, were accounts treated the same as today's accounts with the "aliases" feature checked or not checked?
For the following examples, assume account A is my normal Gmail account, and account B is another Gmail account I'm using via account A.
How does the setting affect (or not affect) any of the following?
- Can I still use
from:Bin order to filter outgoing messages from B?
- When sending a message from account B via A, does any reference to account A exist in the email headers or full text?
- When I get an email sent to account B, and I press reply, the "from address" is automatically populated with account B. Is this feature changed in any way?