0 votes
by (170 points)

HI, We are using Rebex version 1.0 and use this for sending web email using SMTP.net.dll. However while sending multiple emails, we see below issue - Rebex.Net.SmtpException: The server has closed the connection. PLEASE NOTE : This issue is not consistently reproducible.

Attached is the log for more details -

2016-07-18 14:29:26.138 Opening log file.
2016-07-18 14:29:33.462 Opening log file.
2016-07-18 14:29:33.467 INFO Smtp(2) Command: MAIL FROM:ttintuit@yahoo.com SIZE=59590
2016-07-18 14:29:33.891 INFO Smtp(2) Response: 250 OK , completed
2016-07-18 14:29:33.891 INFO Smtp(2) Command: RCPT TO:c2@blank.com
2016-07-18 14:29:34.316 INFO Smtp(2) Response: 250 OK , completed
2016-07-18 14:29:34.316 INFO Smtp(2) Command: DATA
2016-07-18 14:29:34.742 INFO Smtp(2) Response: 354 Start Mail. End with CRLF.CRLF
2016-07-18 14:29:36.944 INFO Smtp(2) Response: 250 OK , completed
2016-07-18 14:40:36.444 INFO Smtp(2) Command: MAIL FROM:ttintuit@yahoo.com SIZE=58718
2016-07-18 14:40:36.448 DEBUG Smtp(2) Info: Connection closed.
2016-07-18 14:40:36.450 ERROR Smtp(2) Info: Rebex.Net.SmtpException: The server has closed the connection.
at wWGvS.bWfGzD.BMJzdYZ()
at wWGvS.bWfGzD.BbLKfs(String& )
at wWGvS.bWfGzD.KsZclZ()
at Rebex.Net.Smtp.cgrDQE(Int32 , Boolean )
at Rebex.Net.Smtp.COvOkZ(String , String )
at Rebex.Net.Smtp.bUTESW(String , String[] , String , Stream )
at Rebex.Net.Smtp.BTPxIKZ(MimeMessage , Stream , MailAddress , MailAddressCollection )
at Rebex.Net.Smtp.Send(MailMessage mail, String sender, String recipients)
2016-07-18 14:41:32.182 INFO Smtp(3) Info: Connecting to smtp.mail.yahoo.com:465 using Smtp 1.0.3854.0.
2016-07-18 14:41:32.693 DEBUG Smtp(3) Info: Connection succeeded.
2016-07-18 14:41:32.693 DEBUG Smtp(3) Info: Upgrading connection to TLS/SSL.
2016-07-18 14:41:32.695 INFO Smtp(3) TLS: State StateChange:Negotiating
2016-07-18 14:41:32.695 DEBUG Smtp(3) TLS: HandshakeMessage:ClientHello was sent.
2016-07-18 14:41:32.943 DEBUG Smtp(3) TLS: HandshakeMessage:ServerHello was received.
2016-07-18 14:41:32.943 DEBUG Smtp(3) TLS: HandshakeMessage:Certificate was received.
2016-07-18 14:41:32.943 DEBUG Smtp(3) TLS: HandshakeMessage:ServerHelloDone was received.
2016-07-18 14:41:32.943 DEBUG Smtp(3) TLS: Verifying server certificate ('C=US, S=California, L=Sunnyvale, O=Yahoo Inc., OU=Information Technology, CN=smtp.mail.yahoo.com').
2016-07-18 14:41:32.944 DEBUG Smtp(3) TLS: Certificate verification result: Accept
2016-07-18 14:41:32.953 DEBUG Smtp(3) TLS: HandshakeMessage:ClientKeyExchange was sent.
2016-07-18 14:41:32.970 DEBUG Smtp(3) TLS: CipherSpec:ChangeCipherSpec was sent.
2016-07-18 14:41:32.970 DEBUG Smtp(3) TLS: HandshakeMessage:Finished was sent.
2016-07-18 14:41:33.220 DEBUG Smtp(3) TLS: CipherSpec:ChangeCipherSpec was received.
2016-07-18 14:41:33.220 DEBUG Smtp(3) TLS: HandshakeMessage:Finished was received.
2016-07-18 14:41:33.220 INFO Smtp(3) TLS: State StateChange:Secured
2016-07-18 14:41:33.221 INFO Smtp(3) TLS: Connection secured using cipher: TLS 1.0, RSA, 128bit AES in CBC mode, SHA1
2016-07-18 14:41:33.222 DEBUG Smtp(3) TLS: Session ID:
8D-37-8F-5B-A1-22-8F-6C-71-8A-83-0C-1C-0D-F6-63-78-CF-AB-26-04-6B-D6-48
B2-B7-60-EE-6C-27-8F-71
2016-07-18 14:41:33.222 DEBUG Smtp(3) Info: Connection upgraded to TLS/SSL.
2016-07-18 14:41:33.669 INFO Smtp(3) Response: 220 smtp.mail.yahoo.com ESMTP ready
2016-07-18 14:41:33.669 INFO Smtp(3) Command: EHLO banvmkumar24
2016-07-18 14:41:33.915 INFO Smtp(3) Response: 250-smtp.mail.yahoo.com
2016-07-18 14:41:33.915 INFO Smtp(3) Response: 250-PIPELINING
2016-07-18 14:41:33.915 INFO Smtp(3) Response: 250-SIZE 41697280
2016-07-18 14:41:33.915 INFO Smtp(3) Response: 250-8 BITMIME
2016-07-18 14:41:33.915 INFO Smtp(3) Response: 250 AUTH PLAIN LOGIN XOAUTH2 XYMCOOKIE
2016-07-18 14:41:33.916 INFO Smtp(3) Command: AUTH PLAIN ****************************************
2016-07-18 14:41:35.494 INFO Smtp(3) Response: 235 2.0.0 OK
2016-07-18 14:41:35.494 INFO Smtp(3) Command: NOOP
2016-07-18 14:41:35.995 INFO Smtp(3) Response: 250 OK , completed
2016-07-18 14:41:36.000 INFO Smtp(3) Command: MAIL FROM:ttintuit@yahoo.com SIZE=58238
2016-07-18 14:41:36.501 INFO Smtp(3) Response: 250 OK , completed
2016-07-18 14:41:36.501 INFO Smtp(3) Command: RCPT TO:x@dummy.com
2016-07-18 14:41:37.001 INFO Smtp(3) Response: 250 OK , completed
2016-07-18 14:41:37.001 INFO Smtp(3) Command: DATA
2016-07-18 14:41:37.502 INFO Smtp(3) Response: 354 Start Mail. End with CRLF.CRLF
2016-07-18 14:41:39.637 INFO Smtp(3) Response: 250 OK , completed
2016-07-18 14:41:39.659 INFO Smtp(3) Command: MAIL FROM:ttintuit@yahoo.com SIZE=58238
2016-07-18 14:41:40.159 INFO Smtp(3) Response: 250 OK , completed
2016-07-18 14:41:40.160 INFO Smtp(3) Command: RCPT TO:x@dummy.com
2016-07-18 14:41:40.660 INFO Smtp(3) Response: 250 OK , completed
2016-07-18 14:41:40.660 INFO Smtp(3) Command: DATA

Applies to: Rebex Secure Mail

1 Answer

0 votes
by (62.8k points)

Hello, you are using version released before 6 years. It is possible that the problem is already solved. Can you please try the current version.

by (170 points)
Thank you Lukas, I will try that. Please answer the other query posted regarding security standards.
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