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bg-edv

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Hello,

anyone know some issues with Mails from yahoo.com? We only get about 30 % of the Mails from your customers at yahoo.com

[26/Apr/2016 14:45:28][2127] {smtps} Task 48 handler BEGIN
[26/Apr/2016 14:45:28][2127] {smtps} Task 48 handler starting
[26/Apr/2016 14:45:28][2127] {smtps} SMTP server session begin; client connected from 98.138.229.69:41409
[26/Apr/2016 14:45:28][2127] {smtps} Sent SMTP greeting to 98.138.229.69:41409
[26/Apr/2016 14:45:28][2127] {smtps} Command EHLO nm33-vm5.bullet.mail.ne1.yahoo.com
[26/Apr/2016 14:45:28][2127] {smtps} Sent reply to EHLO: 250 xxx.xxx.com ...
[26/Apr/2016 14:45:28][2127] {smtps} Command STARTTLS
[26/Apr/2016 14:45:29][2127] {smtps} Successfully switched to TLS mode
[26/Apr/2016 14:45:29][2127] {smtps} Command EHLO nm33-vm5.bullet.mail.ne1.yahoo.com
[26/Apr/2016 14:45:29][2127] {smtps} Sent reply to EHLO: 250 xxx.xxx.com ...
[26/Apr/2016 14:45:29][2127] {smtps} Command MAIL FROM:<bg_test<_at_>yahoo.com>
[26/Apr/2016 14:45:29][2127] {smtps} Sent reply to MAIL: 250 2.1.0 Sender <bg_test<_at_>yahoo.com> ok
[26/Apr/2016 14:45:29][2127] {smtps} Command RCPT TO:<x<_at_>xxx.de>
[26/Apr/2016 14:45:29][2127] {smtps} Sent reply to RCPT: 250 2.1.5 Recipient <x<_at_>xxx.de> ok (local)
[26/Apr/2016 14:45:29][2127] {smtps} Command DATA
[26/Apr/2016 14:45:32][2127] {smtps} 684502 bytes received in command DATA
[26/Apr/2016 14:45:32][2127] {smtps} Message accepted for delivery
[26/Apr/2016 14:45:32][2127] {smtps} Command QUIT
[26/Apr/2016 14:45:32][2127] {smtps} SMTP server session end
[26/Apr/2016 14:45:32][2127] {smtps} Task 48 handler END

at the other 70 % of the Mails we get an error:

[26/Apr/2016 14:36:00][2127] {smtps} Task 44 handler BEGIN
[26/Apr/2016 14:36:00][2127] {smtps} Task 44 handler starting
[26/Apr/2016 14:36:00][2127] {smtps} SMTP server session begin; client connected from 212.82.98.87:21771
[26/Apr/2016 14:36:00][2127] {smtps} Sent SMTP greeting to 212.82.98.87:21771
[26/Apr/2016 14:36:00][2127] {smtps} Command EHLO omp1024.mail.ir2.yahoo.com
[26/Apr/2016 14:36:00][2127] {smtps} Sent reply to EHLO: 250 xxx.xxx.com ...
[26/Apr/2016 14:36:00][2127] {smtps} Command STARTTLS
[26/Apr/2016 14:38:00][2127] {smtps} Failed STARTTLS in SMTP connection with 212.82.98.87
[26/Apr/2016 14:38:00][2127] {smtps} SMTP server session end
[26/Apr/2016 14:38:00][2127] {smtps} Task 44 handler END

I hope someone can help Smile
Thanks
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Pavel Dobry (Kerio)

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Enable debug messages for Network Connections and SSL. That Yahoo server probably uses incompatible SSL cipher suites.
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ComputerBudda

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90% of all connection problems we have in Kerio are with Yahoo
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bg-edv

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Thx for the fast reply. Here is the SSL Log:

[26/Apr/2016 15:14:42][5660] {smtps} Task 53 handler BEGIN
[26/Apr/2016 15:14:42][5660] {conn} Connection from 212.82.98.70:39809 to 192.168.250.200:25, socket 58.
[26/Apr/2016 15:14:42][5660] {smtps} Task 53 handler starting
[26/Apr/2016 15:14:42][5660] {smtps} SMTP server session begin; client connected from 212.82.98.70:39809
[26/Apr/2016 15:14:42][5660] {smtps} Sent SMTP greeting to 212.82.98.70:39809
[26/Apr/2016 15:14:42][5660] {smtps} Command EHLO omp1007.mail.ir2.yahoo.com
[26/Apr/2016 15:14:42][5660] {smtps} Sent reply to EHLO: 250 xxx.xxx.com ...
[26/Apr/2016 15:14:42][5660] {smtps} Command STARTTLS
[26/Apr/2016 15:14:42][5660] {conn} Connection from 212.82.98.70:39809 to 192.168.250.200:25, socket 58.
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 SSL handshake started: before/accept initialization
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 SSL_accept:before/accept initialization
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 SSL_accept:error in SSLv2/v3 read client hello A
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 Client requests does not contain SMTP server name
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 SSL_accept:SSLv3 read client hello A
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 SSL_accept:SSLv3 write server hello A
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 SSL_accept:SSLv3 write certificate A
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 obtained local 1024 bit DHE key exchange parameters for SMTP server connection
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 SSL_accept:SSLv3 write key exchange A
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 SSL_accept:SSLv3 write server done A
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 SSL_accept:SSLv3 flush data
[26/Apr/2016 15:14:42][5660] {conn} SSL debug: id 0x56d3cd0 SSL_accept:error in SSLv3 read client certificate A
[26/Apr/2016 15:16:42][5660] {conn} Connection timeout after 120000 ms (remote=212.82.98.70:39809, local=192.168.250.200:25)
[26/Apr/2016 15:16:42][5660] {conn} Cannot accept SSL connection from 212.82.98.70:39809 to 192.168.250.200:25: SSL code 2, system error: (11) Unknown error 11
[26/Apr/2016 15:16:42][5660] {smtps} Failed STARTTLS in SMTP connection with 212.82.98.70
[26/Apr/2016 15:16:42][5660] {smtps} SMTP server session end
[26/Apr/2016 15:16:42][5660] {conn} Closing socket 58
[26/Apr/2016 15:16:42][5660] {smtps} Task 53 handler END
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Pavel Dobry (Kerio)

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Well, I would focus on that firewall you have in place, which does DNAT to 192.168.250.200. According to various internet tests (eg. https://starttls.info) it timeouts at STARTTLS negotiation.
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bg-edv

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I tryed some tests with TLS:

stattls .info - Time out but also on other Servers i tryed (I think it is down - it entds everytime with this error:
<html> <head><title>504 Gateway Time-out</title></head> <body bgcolor="white"> <center><h1>504 Gateway Time-out</h1></center> <hr><center>nginx/1.4.6 (Ubuntu)</center> </body> </html>)

checktls.com - All green with 100 % with my Mail (behling<_at_>bg-edv.com

ssl-tools.net/mailservers/bg-edv.com (all green and ok)
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