The message search feature can be used to search for messages of a specific type or those containing specific text.
Press Options and select Search from the menu.
The following search conditions can be specified:
In: which folder to search within.
Status: message status flag settings to search for.
From: text to match against the From field of each message.
To: text to match against the To field of each message.
Subj: text to match against the Subject line of each message.
Body: text to match against the body text of each message.
After: if ticked, match only messages after the specified date.
Before: if ticked, match only messages before the specified date.