phpList supports the adding of attachments to your messages. The config/config.php file warns that this feature is experimental and may result in large e-mails. It also cautions that it's generally more acceptable to send a link to a file download, instead of including that file as an attachment in the message sent to the subscriber.
However, there are many situations where you might want to include attachments and doing so is quite simple.
To enable attachments, look for this line in config/config.php:
define("ALLOW_ATTACHMENTS",0);
Change ALLOW_ATTACHMENTS from 0 to 1 to turn on attachment support.
You'll note on the send a message page that there's an additional tab labeled Attach. Click on this tab while preparing your message to add attachments. The attachment tab will display the current (server-set) size limits and allow you to browse for new files to attach:
It's recommended that you add a description of each attachment, although this is only for your...