FeedBurner is a popular RSS feed management service, acquired by Google in 2007. While FeedBurner was developed actively and new features were announced, one feature they have always sorely missed is the ability to customize the email subscription subject line.

All emails reach the subscriber with the subject line filled with the title of the name. What subscribers would ideally like is the post title and perhaps some other information being filled into the subject line, so that they can glance at the list of emails and find out which email contains which article.
It is a trivial tweak for a web application so developed and backed by the might of Google, yet somehow the feature was not included for a long time.
FeedBurner has added the feature finally – you can customize the subscription mails using some parameters.
If you are an email subscriber, you would see the title of this post as a subject line already.
Customize FeedBurner email subscription
To add post title into subject line, login to FeedBurner. Go to Publicize > Email Subscriptions > Email Branding. There are helpful tips on the page regarding what parameters to use.

You can also see the settings I used – fairly easy to configure.