Implement a mail system to confirm user identity

[R1D3R175]

There are 3 possible ways to implement it:

1. Use SMTP with a legit domain that doesn't get blacklisted by Outlook.
2. Create a gmail account and use Selenium to send mails.
3. Use IMAP/POP3 to login into some mail account to receive a confirmation mail (e.g. send "283929" to [email protected] with your studium mail to confirm).

Probably the no. 1 would be the hardest as it involves a lot of aspects.
The no. 2 would be a lot time-consuming and would also be a lot error prone (e.g. consider this scenario: Google asks if you want to configure some recovery contact)
The no. 3 would be the easiest to implement and could also be used with the no. 1 however, gmail doesn't support IMAP or POP3 for personal accounts so we would have to find some free provider that has this kind of service.