I'm using System.Net.Mail to send email. All the things had done right but when the email received (in gmail and yahoo mail), in my email subject appear a string like that: "[***SPAM*** Score/Req: 05.8/5.0]". How can I remove that string?
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likethitnguoi:

How can I remove that string

By not sending spam.

Seriously, many e-mail providers scan incoming e-mail for text patterns. If your message contains certain keyword found often in spam, then you'll likely get the result you see.

Another reason may be that you're sending from an IP-address that's either known to send spam, or regarded as likely to send spam - i.e. a DSL or dial-up connection. The solution here is to send via your ISP's SMTP-servers instead of sending directly.

Hi,

Please read thoese tips for avoiding Spam Filters with System.Net.Mail : http://www.andreas-kraus.net/blog/tips-for-avoiding-spam-filters-with-systemnetmail/

 Thanks for your replies. But I still can't solve my problem.

It is not your code that is adding the [SPAM] to the subject line, it is the mail servers you are sending the mail to. It checks the incoming mail then if it thinks it is spam it will add the [SPAM] string to the start of the subject line. The only way you can stop this is by passing as legitimate mail using the ideas mentioned above.

aspro