我想使用MailKit通过我们的Exchange服务器发送电子邮件,使用该进程的凭据.
使用域/用户名/密码构建NetworkCredential：
using (var client = new SmtpClient(ProtocolLogger))
{
client.Connect(server,port);
// Works
var creds = new NetworkCredential(username,password,domain);
client.Authenticate(creds);
client.Send(msg);
}
如果我在以同一用户身份运行时使用CredentialCache.DefaultNetworkCredentials,则会因MailKit.Security.AuthenticationException而失败：
using (var client = new SmtpClient(ProtocolLogger))
{
client.Connect(server,port);
// Authentication failure
client.Authenticate(CredentialCache.DefaultNetworkCredentials);
client.Send(msg);
}
ProtocolLogger输出如下(邮件服务器和base64编码的字符串已更改)：
Connected to smtp://mymailserver:25/?starttls=when-available
S: 220 mymailserver Microsoft ESMTP MAIL Service ready at Thu,30 Jun 2016 12:45:04 +0930
C: EHLO [172.1.1.2]
S: 250-mymailserver Hello [172.1.1.2]
S: 250-SIZE 51200000
S: 250-PIPELINING
S: 250-DSN
S: 250-ENHANCEDSTATUSCODES
S: 250-STARTTLS
S: 250-X-ANONYMOUSTLS
S: 250-AUTH NTLM LOGIN
S: 250-X-EXPS GSSAPI NTLM
S: 250-8BITMIME
S: 250-BINARYMIME
S: 250-CHUNKING
S: 250-XEXCH50
S: 250 XRDST
C: STARTTLS
S: 220 2.0.0 SMTP server ready
C: EHLO [172.1.1.2]
S: 250-mymailserver Hello [172.1.1.2]
S: 250-SIZE 51200000
S: 250-PIPELINING
S: 250-DSN
S: 250-ENHANCEDSTATUSCODES
S: 250-AUTH NTLM LOGIN
S: 250-X-EXPS GSSAPI NTLM
S: 250-8BITMIME
S: 250-BINARYMIME
S: 250-CHUNKING
S: 250-XEXCH50
S: 250 XRDST
C: AUTH NTLM {EncodedStringRemoved}
S: 334 {EncodedStringRemoved}
C: {EncodedStringRemoved}
S: 535 5.7.3 Authentication unsuccessful
C: AUTH LOGIN
S: 334 {EncodedStringRemoved}
C:
S: 334 {EncodedStringRemoved}
C:
S: 334 {EncodedStringRemoved}
C: QUIT
S: 334 {EncodedStringRemoved}
值得注意的是,System.Net.Mail.SmtpClient在将UseDefaultCredentials属性设置为true时使用DefaultNetworkCredentials,这对我有用.我想使用MailKit,因为ProtocolLogging等额外的功能.
