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I've considered using "magic login link" emails but greylisting[1] seems to be an insurmountable problem. [1] https://en.wikipedia.org/wiki/Greylisting https:/

• ryan-c 9y ago
  Generally greylisting is supposed to let future emails through once it establishes that a server will re-send. It should be possible to detect greylisting and warn the user. "Your email provider temporarily rejected our email to you. We will retry in a few minutes. If this happens persistently, please (check our guide for your provider, $MAJOR_PROVIDER|contact your provider) to figure out how to whitelist our login emails"