System.Web.Mail FAQ

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4.3.3 Some of emails are rejected by some clients, but not all. Printer Friendly   Email This FAQ   Discuss

There are a couple of things that might be going on here.
  • Your SmtpMail.SmtpServer has been black listed by recipients.
  • Your server has been listed in an Open Relay Database, and you are being blacklisted.
  • Your System.Web.Mail code is generating 8bit emails, and they are getting rejected/deleted at various gateways. To check if you are generating 8 bit emails, view a generated emails' headers. If the Content-Transfer-Encoding header is set to 8 bit, this is probably the problem. Check out How do I send non US-ASCII emails? for more information.

 

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