Gmail – Mailman, Gmail, Google Group inter-import

This is now part of standard search within Google Groups.

From Groups: Help: Search and filter:

after:YYYY/MM/DD

Include only messages created after the YYYY/MM/DD date. For example, after:2011/11/02.

before:YYYY/MM/DD

Include only messages created before the YYYY/MM/DD date. For example, before:2011/11/02.

See additionalemail@gmail.com is an alias for realemail@gmail.com, which implies that addtionalemail@gmail.com is something like: real.e.mail@gmail.com re.alemail@gmail.com or realemail+anything@gmail.com

This is not a separate GMail account and so you cannot receive separate emails for this. You do not have a separate inbox for this. You can create a filter so that the emails sent to the additionalemail go to a particular label.

You can try creating accounts on different sites using additionalemail, you try to subscribe to something using this additional email.

If you go to GMail>Settings>Accounts and Imports you can add additionalemail under the Send Mail as and send e-mails as additionalemail (but the complete header of the sent email would reveal your realemail@gmail.com).