Google’s Gmail provides a free SMTP server, it can be utilizing by anybody who has a Gmail account.
Any case you don’t have a Gmail account, you can create a Gmail account.
Then all you require to do is configure your mail client to utilize GMail for outgoing mail server. The details you should utilize are:
- Outgoing Mail (SMTP) Server: smtp.gmail.com
- Use Authentication: Yes
- Use Secure Connection: Yes (this can be TLS or SSL depending on your mail client)
- Username: your GMail account
- Password: your GMail password