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1. #MILESTONE XPROTECT ESSENTIAL GMAIL EMAIL NOTIFICATIONS UPGRADE#
2. #MILESTONE XPROTECT ESSENTIAL GMAIL EMAIL NOTIFICATIONS SOFTWARE#
3. #MILESTONE XPROTECT ESSENTIAL GMAIL EMAIL NOTIFICATIONS CODE#

String addr = toemail.Split(',') // toemail is a string which contains many email address separated by comma SmtpClient SmtpServer = new SmtpClient() New MailMessage(new MailAddress(toemail),

#MILESTONE XPROTECT ESSENTIAL GMAIL EMAIL NOTIFICATIONS CODE#

Try this : Here is the code which i'm using to send emails to multiple user. Message.Body = new TextPart("plain") Ĭlient.Connect(host, port, SecureSocketOptions.StartTls) Message.To.Add(new MailboxAddress(mailTo)) Here is how I implemented SmtpClient with MailKit int port = 587 Read documentation about Smtp Client for more information: You can get Mailkit by downloading it as a Nuget Package. Using Mailkit gave me clearer error messages that I could understand finding the root cause of the problem (license issue). The Smtp Client is now not recommended to use by Microsoft because of security issues and you should instead be using MailKit. Solved problem by changing Smtp Client to Mailkit. MailAddress from = new MailAddress(mailFrom) Ĭlient.DeliveryMethod = SmtpDeliveryMethod.Network Ĭlient.Credentials = new NetworkCredential Using (SmtpClient client = new SmtpClient()) String mailFrom = mailTo = mailTitle = "Testtitle"

Here is the code that I'm using int port = 587 The code seems to work fine with Google account and when allowing less secure apps. I've tried all the answers above but still get this error with Office 365 account.

#MILESTONE XPROTECT ESSENTIAL GMAIL EMAIL NOTIFICATIONS SOFTWARE#

In my case, my user was trying to connect the software to a server that was forcing an immediate SSL connection, which is the legacy method that is not supported by Microsoft in.

Unfortunately, as it always happens when a new standard is implemented, there is a hodgepodge of compatibility with all the clients and servers out there. STARTTLS became the standard for SMTP encryption.

#MILESTONE XPROTECT ESSENTIAL GMAIL EMAIL NOTIFICATIONS UPGRADE#

Communication would start using plaintext, then use the STARTTLS command to upgrade to an encrypted connection. As time went on they realized it was silly to waste two port numbers for one service and they devised a way for services to allow plaintext and encryption on the same port using STARTTLS. Second, a quick SMTP history lesson for those who stumble upon this problem in the future:īack in the day, when services wanted to also offer encryption they were assigned a different port number, and on that port number they immediately initiated an SSL connection. See the MSDN documentation for more details. If the EnableSsl flag is set, the server must respond to EHLO with a STARTTLS, otherwise it will throw an exception. NET SmtpClient only supports encryption via STARTTLS. Port 465 is technically deprecated.Īfter a bunch of packet sniffing I figured it out.