c# - Mailkit SMTP - StartTLS & TLS flags -

i trying connect icloud via smtpclient

the settings using follows:

server name: smtp.mail.me.com
ssl required: yes
if see error message when using ssl, try using tls or starttls instead.
port: 587
smtp authentication required: yes - relevant username , password

if use ssl "handshake failed due unexpected packet format"

if don't use ssl visual studio debugger hangs on connect.

i think problem not telling smtpclient use tls cant find documentation on how this.

the code follows:

using (var client = new smtpclient()) {     client.timeout = 1000 * 20;     //client.capabilities.     client.authenticationmechanisms.remove ("xoauth2");      client.connect("smtp.mail.me.com", 587, false); //dies here     //client.connect(servername, port, usessl);     //can set tls or starttls here??     client.authenticate(username, password);     client.send(formatoptions.default, message); } 

am able set tls or starttls manually. 1 thing did try following did not seem work

client.connect(new uri("smtp://" + servername + ":" + port + "/?starttls=true")); 

thanks this.

the connect() method using allows enabling/disabling ssl-wrapped connections not same thing starttls.

due confusion, i've implemented separate connect() method makes more obvious going on:

using (var client = new smtpclient()) {     // note: don't set timeout unless know doing.     //client.timeout = 1000 * 20;      // removing here won't because authenticationmechanisms     // not populated until client connects server.     //client.authenticationmechanisms.remove ("xoauth2");      client.connect ("smtp.mail.me.com", 587, securesocketoptions.starttls);      client.authenticationmechanisms.remove ("xoauth2");      client.authenticate (username, password);     client.send (message); } 

try that.