Mails To Non-existing Addresses Are Sent Repeatedly?

Nov 27, 2010

I have a mailing system set up that repeatedly sends news to registered users on my website. However, sometimes the e-mail doesn't arrive, for various reasons (like a full inbox, closed mail account, etc). I noticed that mails to these invalid receivers are being sent repeatedly, until they finally arrive or timeout.

I was wondering if there is any way to prevent this, like an attribute in the MailMessage or SmtpClient classes? I don't want to needlessly strain the mailserver, as it is shared with other websites, so these mails should be send just once, on the first attempt, whether they arrive or not.

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