Comment by uxp8u61q

Just try it, google will merrily redirect all emails to a+b@org.com to a@org.com. To answer your questions:

> Where/when/how is the sneed+alias@org.com created?

Where: in gmail's alias list

When: at account creation

How: gmail/gw redirect everything of the form abc+xyz@domain to abc@domain

> How is the user sneed@org.com doing this if they don't have administrative access to organization management?

The user isn't doing anything, it's a "feature" of google mail.