Certain Emails Not Being Returned

[Sleepingeye]

From manual page: https://php.net/function.imap-search

I've tried on two different servers, and it seems that either:

1. Emails that were moved from a different server.
   or
2. Emails that have a different "To" address than currently connected to.

Don't work. I've manually Telnet'd to the servers in question, and copy-pasted the query - the server returns the expected results of the messages.

For example, if I have the message that has the following attributes FROM: abc@abc.com TO xyz@xyz.com SUBJECT test, and the server I'm connected to is "def@def.com", performing an imap_search([def@def.com], 'SUBJECT "TEST"') or imap_search([def@def.com], 'FROM "abc"') returns nothing.