RSS is the most convenient way to receive Table of Contents (TOC) alerts. All of the TOC alerts for each journal are gathered into one place. See How to receive alerts for details.
Email can also be used to receive TOC Alerts, but it tends to clutter up one's in-box. It can be difficult to tell which TOCs have been viewed. See How to receive alerts for details
It is a rare journal publisher that does not provide RSS feed its journals. Just go to the publisher's website and look for the word RSS or the or or icons.
Search Google ... just type in the word RSS and the name of the journal.
Search within Google Reader.
Adding RSS feed to an RSS reader
Copy and paste the link for an RSS feed for into your RSS reader.
Removing an RSS feed
Simply remove the RSS feed from your RSS reader.
In contrast, stopping an automated email alert may require password access to the account from which the email alert was created.