when using relay-hosting.secureserver.net to send email, "Email from address" was labeled unknown

[chrisliang287]

when using relay-hosting.secureserver.net to send email with code below, email recipient got warning from gmail the "Email From Address" is not verified and should not click on any link.  How can I resolve/remove this warning message???

 Host = "relay-hosting.secureserver.net",
EnableSsl = false,
UseDefaultCredentials = true,
DeliveryMethod = SmtpDeliveryMethod.Network,

using (var message = new MailMessage()
{
From = new MailAddress(mygmailAccount),
Subject = subject,
Body = body,
})
{
foreach (string to in tos)
message.To.Add(to);

smtp.Send(message);
}

[PL281 · Accepted solution]

@chrisliang287 

I am an end user like you and going through some unanswered posts. I'm not sure if you got this resolved but if not, I would try sending it from an email address at the domain that the server is using vs your Gmail account - as using your gmail account could make the email look like spam since it didn't originate from Gmail