About Sending mail through SMTP

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Hi,
Is this possible to send a mail if SMTP USERNAME & FROM ADDRESSES are different ?

For example ;

message.From = new MailAddress("bbbb@mydomain.com");
            message.To.Add(new MailAddress(to));
            message.CC.Add(new MailAddress(cc));
            message.Bcc.Add(new MailAddress(bcc));
            message.Subject = subject;
            message.Body = body;
            message.IsBodyHtml = true;
            
            SmtpClient mailClient = new SmtpClient("mydomain");
            mailClient.EnableSsl = true;
            mailClient.Port = Convert.ToInt32(objSettings.Port);
            mailClient.UseDefaultCredentials = true;
            mailClient.Credentials = new NetworkCredential("aaaa@mydomain.com", "password");

Here i specified from address as "bbbb@mydomain.com" and smtp username is "aaaa@mydomain.com". But I'm getting mail from "aaaa@mydomain.com" even though I was set "From" address as "bbbb@mydomain.com".

How will I get mail from my "From" (custom address , will change dynamically) address with diff smtp username ?

Please Reply,