When you install Debian, you may want to use some tools or softwares that send emails hrough a Mail Transfer Agent (MTA) like Exim, and you probably want these emails right in your mailbox. For example, I think of 2 tools which could use such a MTA:
- apticron, a script that informs you about the updates available for your OS,
- mutt, a text-based mail client.
I have an Yahoo email account for more than 15 years now and, as a heavy user of their services, I was curious about the SMTP relay that Yahoo offer to people who already have an account.