When sending mail, the username and password should be given to get access to the mail server. And then why “from” is still needed.
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When sending mail, the username and password should be given to get access to the mail server. And then why “from” is still needed.
Depending on your mail server, you might be allowed to authenticate as one user, but then send mail as several other users. For example, you might want to log in as yourself and then send out your company newsletter as “newsletter@company.com”.