SmtpClient with Gmail

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忘了有多久 2020-11-29 03:47

I\'m developing a mail client for a school project. I have managed to send e-mails using the SmtpClient in C#. This works perfectly with any server but it doesn

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感动是毒 (楼主)

2020-11-29 04:34

I started getting this with GMail in May 2013 after working for 6 momths. The Mono project's Using Trusted Roots Respectfully document provided guidance on work around. I chose option #1:

ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

It is too disruptive to have e-mail for my service stop working without warning.

Update Aug 26 2016: user Chico suggested the following complete implementation of the ServerCertificateValidationCallback callback. I have not tested.

ServicePointManager.ServerCertificateValidationCallback = MyRemoteCertificateValidationCallback;

bool MyRemoteCertificateValidationCallback(System.Object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) {
    bool isOk = true;
    // If there are errors in the certificate chain, look at each error to determine the cause.
    if (sslPolicyErrors != SslPolicyErrors.None) {
        for (int i=0; i