Email going straight to Junk

Question

I have the following code in vb.net running on a VPS and every time i send a email it goes straight to peoples junk box. any help?

 Dim email As MailMessage
            email = New MailMessage
            email.From = New MailAddress("Email@address", "Name")
            email.To.Add(New MailAddress(Toemail))
            email.Subject = subject
            email.Body = HTMLstr
            email.IsBodyHtml = True

            Dim SmtpServer As New SmtpClient()
            SmtpServer.UseDefaultCredentials = False
            SmtpServer.EnableSsl = False
            SmtpServer.Credentials = New Net.NetworkCredential("Email@Address", "Password")
            SmtpServer.Port = 25
            SmtpServer.Host = "localhost"
            SmtpServer.Send(email)
            SmtpServer.Dispose()

Answer 1

Spam filters depend on the content of the email as opposed to the programming that goes behind sending the email:

Spam filters look at a long list of criteria to decide whether your email is junk. They might look for spammy phrases like “CLICK HERE!” or “FREE! BUY NOW!” They’ll assign points every time they see one of those phrases. Certain criteria get more points than others. Here’s a sample of criteria from SpamAssassin

Talks about lots of money (.193 points) Describes some sort of breakthrough (.232 points) Looks like mortgage pitch (.297 points) Contains urgent matter (.288 points) Money back guarantee (2.051 points) If your campaign’s total “spam score” exceeds a certain threshold, then your email goes to the junk folder. You’re probably thinking, “What’s the threshold I need to stay under?” Sorry, but the number is different for every server.

As for that list of “spammy” criteria, it’s constantly growing and adapting, because spam filters learn more about junk every time someone clicks the spam button in their email program.

Spam filters even sync up with each other to share what they’ve learned. Although there's no magic formula, we can help you avoid common mistakes that send newsletters to junk folders.

Avoid these common mistakes

These are the most common mistakes we see new email marketers make, which result in accidental spam filtering:

Using spammy phrases, like “Click here!” or “Once in a lifetime opportunity!” Going crazy with exclamation points!!!!!!!!!!!!!!! USING ALL CAPS, WHICH IS LIKE SCREAMING AT THE TOP OF YOUR LUNGS VIA EMAIL (especially in the subject line) Coloring fonts bright red or green Coding sloppy HTML, usually from converting a Microsoft Word file to HTML Creating an HTML email that’s nothing but one big image, with little or no text (since spam filters can’t read images, they assume you’re a spammer that’s trying to trick them) Using the word “test” in the subject line (agencies run into this when sending drafts to clients for approval) Sending a test to multiple recipients within the same company (that company’s email firewall can only assume it’s a spam attack) Designing HTML email in Word and exporting the code to HTML (That code is sloppy, and spam filters hate it.)

Source: MailChimp: How to Avoid Spam Filters