> "sometimes e-mails take 1-2 min to arrive, very occasionally even half an hour" That's because SMTP (the protocol that moves email around) doesn't guarantee

> "sometimes e-mails take 1-2 min to arrive, very occasionally even half an hour" That's because SMTP (the protocol that moves email around) doesn't guarantee delivery in any specific time period. Many MTAs (message transfer agents) are configured by default use retry intervals measured in minutes, not seconds. Relying on email for authentication means asking your users to wait minutes, not seconds, and asking users to wait minutes to get logged in to your website is horrible usability.