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Server does not support secure connections

I'm trying to send email from an ASP.NET site hosted on a Plesk account. I've managed to send email before form an Office 365 account but I am not having any luck. I keep getting the following error:


System.Net.Mail.SmtpException: Server does not support secure connections. at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint) at System.Net.Mail.SmtpTransport.GetConnection(ServicePoint servicePoint) at System.Net.Mail.SmtpClient.GetConnection() at System.Net.Mail.SmtpClient.Send(MailMessage message) at PeaceOfMail.Contact.sendEmail()


I've tried using port 25 

setting EnableSsl = false

setting Host = and host =

I feel like I'm missing something very basic but I cannot figure out what it is. 

Thanks for you help

Helper III

what happens when you use port 465

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please guide me regardng this