[C #] email sending method summary)

The "system. net. Mail" provided in. NET Framework 2.0 can be easily implemented. This article lists three methods for sending:
1. Use localhost;
2. Use normal SMTP;
3. SMTP over SSL;

For example:

1. Use localhost


1 Public void sendmaillocalhost ()
2 ...{
3 system. net. Mail. mailmessage MSG = new system. net. Mail. mailmessage ();
4 msg. to. Add ("a@a.com ");
5 msg. to. Add ("B @ B .com ");
6 /**//*
7 * msg. to. Add ("B @ B .com ");
8 * msg. to. Add ("B @ B .com ");
9 * msg. to. Add ("B @ B .com"); can be sent to multiple people
10 */
11 msg. CC. Add ("c@c.com ");
12 /**//*
13 * msg. CC. Add ("c@c.com ");
14 * msg. CC. Add ("c@c.com"); can be copied to multiple people
15 */
16 MSG. From = new mailaddress ("a@a.com", "alphawu", system. Text. encoding. utf8 );
17/** // * the preceding three parameters are respectively the sender address (which can be written as needed), sender name, and encoding */
18 MSG. Subject = "this is a test email"; // mail title
19 msg. subjectencoding = system. Text. encoding. utf8; // email title Encoding
20 msg. Body = "Mail content"; // mail content
21 msg. bodyencoding = system. Text. encoding. utf8; // email Content Encoding
22 msg. isbodyhtml = false; // whether it is an HTML email
23 MSG. Priority = mailpriority. High; // mail priority
24
25 smtpclient client = new smtpclient ();
26 client. Host = "localhost ";
27 object userstate = MSG;
28 try
29 ...{
30 client. sendasync (MSG, userstate );
31 // you can simply use client. Send (MSG );
32 MessageBox. Show ("sent successfully ");
33}
34 catch (system. net. Mail. smtpexception ex)
35 ...{
36 MessageBox. Show (ex. message, "email sending error ");
37}
38}
39


2. Use normal SMTP


1 Public void sendmailusezj ()
2 ...{
3 system. net. Mail. mailmessage MSG = new system. net. Mail. mailmessage ();
4 msg. to. Add ("a@a.com ");
5 msg. to. Add ("B @ B .com ");
6 /**//*
7 * msg. to. Add ("B @ B .com ");
8 * msg. to. Add ("B @ B .com ");
9 * msg. to. Add ("B @ B .com"); can be sent to multiple people
10 */
11 msg. CC. Add ("c@c.com ");
12 /**//*
13 * msg. CC. Add ("c@c.com ");
14 * msg. CC. Add ("c@c.com"); can be copied to multiple people
15 */
16 MSG. From = new mailaddress ("a@a.com", "alphawu", system. Text. encoding. utf8 );
17/** // * the preceding three parameters are respectively the sender address (which can be written as needed), sender name, and encoding */
18 MSG. Subject = "this is a test email"; // mail title
19 msg. subjectencoding = system. Text. encoding. utf8; // email title Encoding
20 msg. Body = "Mail content"; // mail content
21 msg. bodyencoding = system. Text. encoding. utf8; // email Content Encoding
22 msg. isbodyhtml = false; // whether it is an HTML email
23 MSG. Priority = mailpriority. High; // mail priority
24
25 smtpclient client = new smtpclient ();
26 client. Credentials = new system. net. networkcredential ("username@zj.com", "userpass ");
27 // the email address and password registered at zj.com
28 client. Host = "smtp.zj.com ";
29 object userstate = MSG;
30 try
31 ...{
32 client. sendasync (MSG, userstate );
33 // you can simply use client. Send (MSG );
34 MessageBox. Show ("sent successfully ");
35}
36 catch (system. net. Mail. smtpexception ex)
37 ...{
38 MessageBox. Show (ex. message, "email sending error ");
39}
40}
41


The above method is not applicable to all SMTP, and zj.com can be used after testing, but smtp.163.com cannot.


3. SMTP over SSL


1 Public void sendmailusegmail ()
2 ...{
3 system. net. Mail. mailmessage MSG = new system. net. Mail. mailmessage ();
4 msg. to. Add ("a@a.com ");
5 msg. to. Add ("B @ B .com ");
6 /**//*
7 * msg. to. Add ("B @ B .com ");
8 * msg. to. Add ("B @ B .com ");
9 * msg. to. Add ("B @ B .com"); can be sent to multiple people
10 */
11 msg. CC. Add ("c@c.com ");
12 /**//*
13 * msg. CC. Add ("c@c.com ");
14 * msg. CC. Add ("c@c.com"); can be copied to multiple people
15 */
16 MSG. From = new mailaddress ("a@a.com", "alphawu", system. Text. encoding. utf8 );
17/** // * the preceding three parameters are respectively the sender address (which can be written as needed), sender name, and encoding */
18 MSG. Subject = "this is a test email"; // mail title
19 msg. subjectencoding = system. Text. encoding. utf8; // email title Encoding
20 msg. Body = "Mail content"; // mail content
21 msg. bodyencoding = system. Text. encoding. utf8; // email Content Encoding
22 msg. isbodyhtml = false; // whether it is an HTML email
23 MSG. Priority = mailpriority. High; // mail priority
24
25 smtpclient client = new smtpclient ();
26 client. Credentials = new system. net. networkcredential ("username@gmail.com", "password ");
27 // write your Gmail mailbox and password above
28 client. Port = 587; // port used by Gmail
29 client. Host = "smtp.gmail.com ";
30 client. enablessl = true; // encrypted by SSL
31 object userstate = MSG;
32 try
33 ...{
34 client. sendasync (MSG, userstate );
35 // you can simply use client. Send (MSG );
36 MessageBox. Show ("sent successfully ");
37}
38 catch (system. net. Mail. smtpexception ex)
39 ...{
40 MessageBox. Show (ex. message, "email sending error ");
41}
42}
43
Using Gmail to send emails, the success rate is extremely high, and almost all emails can be sent. It is recommended.