E-mail authentication and relevant ideas like DMARC, SPF, DKIM, BIMI, MTA-STS, TLS-RPT, RUA, RUF, together with the comparison amongst AntiSpam and DMARC, plus the principle of DMARC Alignment, are essential in knowing how email stability and integrity are taken care of. This is an summary of each time period:E-mail Authentication: This is a course