The techniques we've discussed so far apply to messages sent to all the members of a particular list. You can also use user attributes to define a target subset of members to which a particular message should be sent.
Let's say you wanted to e-mail only members who lived in Albania, whose favorite food is pizza. When composing your message, click on the Criteria tab to add criteria based on attributes. Select the applicable attributes and remember to check the Use this one checkboxes where applicable:
After clicking on Save Changes, you can proceed to compose and send the message as you normally would. It will only be sent to users whose criteria match your selections.
Note that criteria-based selections don't work with plain text attributes, as the members' attributes can't be matched against previously known values. Only select, radio, or checkbox attributes are available.