Gmail

Gmail is the most popular web-based e-mail service and is provided by Google. With it, occasionally composing and sending e-mail messages manually to one or a few people is not a problem. But what if you want to send an e-mail at a predefined time when you are not awake or to multiple recipients? Consider the following scenarios:

• You want to send a surprise birthday greeting to your friend at a fixed time; neither earlier nor later
• You need to send customized e-mails to hundreds of people at a time
• You need to send e-mails periodically

For all these scenarios, GAS has the answers:

• Using GAS, you can build a mail merger application to send e-mails with customized greetings or messages to n number of people.
• You can extract information buried in e-mails from your inbox and store and organize them in Google Sheets or Docs.
• You can even convert the data or contents of a Google Sheet or Docs to a PDF or any other file format and send it as an e-mail attachment, or just save the created file in Drive and include only the file's URL as a hyperlink in e-mail messages.
• In addition, GAS also allows you to mark selected messages as important, or starred. You can also add, delete, and update your Gmail Contacts using the Contacts service.

The following screenshot shows how Gmail classifies or groups messages with labels: