Sorry for your trouble. I notice you used a gmail.com email address to sign up for this forum, so it seems the Google login option should be available to you, but I understand if you wish to use e.g. an institutional email account for login. I don’t see any mail delivery failures for said gmail.com account, so I presume you tried the email option with another email address.
Reviewing the email logs, it appears that several email addresses people are entering are non-obviously invalid, i.e. they “look fine”, but e.g. are mistyped so that they do not correspond to anyone’s actual email address. There are tools available to more comprehensively validate email addresses, and we will implement one shortly so as to mitigate that particular issue.