Operator	Effect
stream:stream	Narrow to messages on stream stream
topic:topic	Narrow to messages with topic topic
pm-with:email	Narrow to private messages with email
sender:email	Narrow to messages sent by email
sender:me	Narrow to messages sent by you.
near:id	Center the view around message ID id
id:id	Narrow to just message ID id
is:alerted	Narrow to messages with alert words.
is:mentioned	Narrow to messages that mention you.
is:private	Narrow to private messages.
is:starred	Narrow to starred messages.
keyword	Search for keyword in the topic or message content

You can use any combination of these search operators in a single query. For example:

  stream:streamname sender:user@example.com keyword

would search for messages sent by user@example.com to stream streamname containing the keyword keyword.