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I accidentally discovered that the validation rules allow NUL bytes in the email address login.
As a result, I get an error from an SMTP server that doesn't like this address.
# exim4
501 NUL characters are not allowed in SMTP commands
# mailpit
451 4.3.5 Unable to process mail
[smtpd] error parsing message: malformed MIME header line: Received: from [127.0.0.1]
I accidentally discovered that the validation rules allow NUL bytes in the email address login.
As a result, I get an error from an SMTP server that doesn't like this address.
Code example
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