How send email over tls (vb,net or c#)

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Hi i try to send email from my organization email server,
i get this error: relay access denied
and my server administrator tell me: first log in to server

my email server port is 587.

how i can send email over tls protocol in vb.net or c#?

check tls out:

Checking weather@irimo.ir
looking up MX hosts on domain "irimo.ir"
mail.irimo.ir (preference:10)
Trying TLS on mail.irimo.ir[185.14.80.133] (10):
seconds test stage and result
[000.255] Connected to server
[001.148] <-- 220 mail.irimo.ir ESMTP Postfix
[001.148] We are allowed to connect
[001.148] --> EHLO checktls.com
[001.391] <-- 250-mail.irimo.ir
250-PIPELINING
250-SIZE 15728640
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
[001.391] We can use this server
[001.392] TLS is an option on this server
[001.392] --> STARTTLS
[001.626] <-- 220 2.0.0 Ready to start TLS
[001.626] STARTTLS command works on this server
[002.131] Cipher in use: DHE-RSA-AES256-SHA
[002.131] Connection converted to SSL
[002.181]
Certificate 1 of 3 in chain:
subject= /C=IR/ST=TH/O=Touca Collaboration Suite/OU=Touca Collaboration Suite/CN=mail.irimo.ir
issuer= /C=IR/ST=TH/L=TH/O=Touca Collaboration Suite/OU=Touca Collaboration Suite/CN=mail.irimo.ir
[002.229]
Certificate 2 of 3 in chain:
subject= /C=IR/ST=TH/O=Touca Collaboration Suite/OU=Touca Collaboration Suite/CN=mail.irimo.ir
issuer= /C=IR/ST=TH/L=TH/O=Touca Collaboration Suite/OU=Touca Collaboration Suite/CN=mail.irimo.ir
[002.277]
Certificate 3 of 3 in chain:
subject= /C=IR/ST=TH/O=Touca Collaboration Suite/OU=Touca Collaboration Suite/CN=mail.irimo.ir
issuer= /C=IR/ST=TH/L=TH/O=Touca Collaboration Suite/OU=Touca Collaboration Suite/CN=mail.irimo.ir
[002.278] Cert NOT VALIDATED: unable to get local issuer certificate
[002.278] this may help: What Is An Intermediate Certificate
[002.278] So email is encrypted but the domain is not verified
[002.279] Cert Hostname VERIFIED (mail.irimo.ir = mail.irimo.ir)
[002.279] ~~> EHLO checktls.com
[002.662] <~~ 250-mail.irimo.ir
250-PIPELINING
250-SIZE 15728640
250-VRFY
250-ETRN
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
[002.662] TLS successfully started on this server
[002.662] ~~> MAIL FROM:<test@checktls.com>
[004.496] <~~ 250 2.1.0 Ok
[004.496] Sender is OK
[004.497] ~~> RCPT TO:<weather@irimo.ir>
[006.386] <~~ 250 2.1.5 Ok
[006.387] Recipient OK, E-mail address proofed
[006.387] ~~> QUIT
[006.713] <~~ 221 2.0.0 Bye

Posted 13-Feb-15 20:40pm

Sourcenew

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Kuthuparakkal 17-Feb-15 22:50pm

You need to set EnableSsl property to true.

2 solutions

Solution 1

see here :
https://technet.microsoft.com/en-gb/library/cc784450(v=ws.10).aspx

are you authenticated in the domain when trying to run your code....this was my issue.

Posted 17-Feb-15 11:31am

Learning_slowly

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Kuthuparakkal · Accepted Answer · 2015-02-17T16:50:00

Solution 2

You need to set EnableSsl property to true.

C#

SmtpClient client = new SmtpClient(exchangeServer, 587);
client.Credentials = new System.Net.NetworkCredential(username, password);
client.EnableSsl = true; //This is the you need to do
client.Send(msg);

Posted 17-Feb-15 16:50pm

Kuthuparakkal