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Let the mail_username required except for sendmail
During the setup the "mail_username" was required and it was then undone, so using the sendmail driver we can let the username empty. It would be bad to let the username optional for every drivers, because in some configurations, like SMTP, the username is required for the SMTP server so if the user let it empty its mail configuration will be bad. The mail_username is now optional only if the mail driver is sendmail. See: cachethq#3244
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