Featmap email doesn't work with office365 exchange online.

[lijun1234]

Line 61 in email.go uses smtp.PlainAuth. This authentication type has been disabled by microsoft office 365 exchange online.
61 smtp.PlainAuth("", smtpUser, smtpPass, smtpServer),

Please consider more secure way to achieve the smtp authentication so featmap email function will work with modern smtp server.
https://pkg.go.dev/net/smtp