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Upgrading from 21.11 to 21.12 breaks client.SendAsync


    var client = GetSmtpClient();

static SmtpClient GetSmtpClient()
    var host = Config.MailSettings.PrimaryProvider.Host;
    var port = Config.MailSettings.PrimaryProvider.Port;
    var username = Config.MailSettings.PrimaryProvider.Username;
    var password = Config.MailSettings.PrimaryProvider.Password;

    var client = new SmtpClient(host, port, username, password, SecurityOptions.SSLExplicit);
    client.AllowedAuthentication = SmtpKnownAuthenticationType.Login;

    return client;

no mention of breaking chages:


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