[英]C# SMTP mail sending
我希望通過C#控制台應用程序發送電子郵件。 我找到了源代碼-大部分看起來都差不多。但是我想我的問題是,我不知道該問題的用法。
那么,我該如何克服這個問題呢?
謝謝 ..
這正是我發送電子郵件的方式。 這里的代碼(您必須使用正確的值替換port , Server和enablesl )
public static void SendMail(string addressTo, string addressFrom, string mailSubject, string mailBody)
{
NetworkCredential myCredential = new NetworkCredential(_userName, _passWord);
SmtpClient client = new SmtpClient();
client.Host = "99.99.127.233";
client.Port = 417;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.UseDefaultCredentials = false;
client.Credentials = myCredential;
client.EnableSsl = true;
MailAddress from = new MailAddress(addressFrom);
MailAddress to = new MailAddress(addressTo);
MailMessage message = new MailMessage(from, to);
message.Body = mailBody;
message.BodyEncoding = System.Text.Encoding.UTF8;
message.Subject = mailSubject;
message.SubjectEncoding = System.Text.Encoding.UTF8;
client.Send(message);
}
我在smtp.gmail.com上遇到了同樣的問題。 我啟用了“訪問不太安全的應用程序”並關閉了兩步驗證。 有效。
試試這個代碼
MailMessage message = new MailMessage("sender@gmail.com", "receiver@gmail.com");
message.Subject = "Subject";
string body = "Mail Body";
message.Body = body;
SmtpClient smtpClient = new SmtpClient();
smtpClient.Host = "smtp.gmail.com";
smtpClient.EnableSsl = true;
NetworkCredential networkCredentials = new NetworkCredential("sender@gmail.com", "<password>");
smtpClient.UseDefaultCredentials = false;
smtpClient.Credentials = networkCredentials;
smtpClient.Port = 587;
smtpClient.Send(message);
我現在正在做類似的事情,只是在Windows窗體中。 我使用圖書館EASendMail( https://www.emailarchitect.net/easendmail )。 它具有各種類,例如標准Mail類,您可以像這樣使用:
void SmtpSend(string from, string to, string subject, string body)
{
// \/ Use
EASendMail.SmtpMail testMail = new EASendMail.SmtpMail("test");
testMail.From = from;
testMail.To = to;
testMail.Subject = subject;
testMail.TextBody = body;
// Alternatively, you can use HTML bodies with testMail.HtmlBody = "<html><head></head><body></body>" etc.
// Just play around with it.
// \/ Use the SmtpClient class to send your SmtpMail objects \/
EASendMail.SmtpClient smtpClient = new EASendMail.SmtpClient();
smtpClient.Credentials = new NetworkCredentials("username", "password");
smtpClient.SendMail(testMail);
}
void main()
{
SmtpSend("sender@yourapp.com", "reciever@yourapp.com", "Test Mail", "Test Body");
}
如果要直接連接到服務器,也可以使用SmtpServer
對象:
SmtpServer smtpgm = new SmtpServer("smtp.gmail.com");
EASendMail.SmtpClient cln = new EASendMail.SmtpClient();
smtpgm.Port = 587;
smtpgm.User = Console.ReadLine();
smtpgm.Password = Console.ReadLine();
smtpgm.Alias = "W";
smtpgm.Protocol = ServerProtocol.SMTP;
smtpgm.ConnectType = SmtpConnectType.ConnectSTARTTLS;
如果此消息發送給您自己(或您可以從中獲得幫助的人)托管的postfix ,請確保啟用login
SASL身份驗證方案。 默認情況下,通常僅啟用plain
文本。
否則,您的請求將被視為匿名 (無論您在SmtpClient
上的憑據設置如何),並且其余的配置可能會導致您的請求被阻止。
TL; DR
通過在postfix配置中啟用詳細調試,可以在postfix機器上進行故障排除。 通常可以通過添加以下行來在/etc/postfix/main.cf中完成此操作:(其中81.82.83.84
是運行SmtpClient代碼的計算機的(公共)IP地址)
debug_peer_list = 81.82.83.84
在調查您的日志記錄時(通常在/var/log/mail.info
),不要讓SmtpClient
發出新請求。
成功的會話將顯示傳入的( <
) AUTH login
請求,從而導致成功的答復( Authentication successful
)
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 250-smtpserver.smtpdomain.com
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 250-PIPELINING
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 250-SIZE 20480000
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 250-VRFY
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 250-ETRN
# Postfix tells SmtpClient that it can use AUTH "LOGIN" scheme
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 250-AUTH PLAIN LOGIN
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 250-AUTH=PLAIN LOGIN
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 250-ENHANCEDSTATUSCODES
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 250-8BITMIME
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 250 DSN
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: watchdog_pat: 0x55c423dbbdd0
# AUTH request
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: < unknown[81.82.83.84]: AUTH login b3JnYW5pbW1vQGZveGlubm9xxx
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: query milter states for other event
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: milter8_other_event: milter inet:localhost:8891
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: xsasl_dovecot_server_first: sasl_method login, init_response b3JnYW5pbW1vQGZveGlubm9xxx
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: xsasl_dovecot_handle_reply: auth reply: CONT?1?UGFzc3dv
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 334 UGFzc3dv
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: < unknown[81.82.83.84]: QXplcnR5MDE=
# AUTH reply
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: xsasl_dovecot_handle_reply: auth reply: OK?1?user=authenticationuser
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: > unknown[81.82.83.84]: 235 2.7.0 Authentication successful
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: watchdog_pat: 0x55c423dbbdd0
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: < unknown[81.82.83.84]: MAIL FROM:<user@destinationdomain.com>
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: extract_addr: input: <user@destinationdomain.com>
Jul 10 08:04:20 smtpserver postfix/submission/smtpd[13312]: smtpd_check_addr: addr=user@destinationdomain.com
如果不啟用login
身份驗證方案,則250-AUTH
響應將僅包含PLAIN
,並且SmtpClient
將不進行身份驗證。
如前所述,這很可能導致您的郵件被Helo,客戶端,中繼,發件人或收件人限制所阻止。
如果您的后綴使用dovecot進行SASL身份驗證,則可以在/etc/dovecot/conf.d/10-auth.conf
啟用login
SASL身份驗證方案:
auth_mechanisms = plain login cram-md5
(並確保配置文件中僅存在一種這樣的配置。)
可以在以下位置找到更多信息: https : //wiki2.dovecot.org/Authentication/Mechanisms (顯示為在plain
和login
旁邊還啟用cram-md5
)
如果您的消息仍被進一步阻止,則可以添加permit_sasl_authenticated
作為后綴限制設置的第一個限制(至少是暫時的),以進行進一步調查。 例如(在我的情況下,我選擇將其放在permit_mynetwork
之后,以允許從本地主機發送郵件)
smtpd_helo_restrictions = permit_mynetworks,permit_sasl_authenticated,reject_non_fqdn_helo_hostname,reject_invalid_helo_hostname,permit
smtpd_sender_restrictions = permit_mynetworks,permit_sasl_authenticated,reject_non_fqdn_sender,reject_unknown_sender_domain,permit
#...
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