Exchange 2016 CU9 on WinServer 2012r2 listening on port 2551

Spamfilter.ini   EnableTLSSupport=1

 

If I disable TLS 1.0 and enable TLS1.1 or TLS1.2 only for Exchange I get Socket Error 10053 when spamfilter sends the email to exchange.  Below is sample from the logfile with TLS 1.2 only enabled for exchange when sending email from my personal yahoo.com account to my domain.com account.

 

With TLS 1.1 or 1.2 enabled I can telnet to exchange and send an email to my domain.com account.

 

I need to enable only TLS 1.2 on exchange.

 

07/09/18 20:27:00:820 -- (41059152) Detected TCP Connection: 74.6.135.125 on port: 25
07/09/18 20:27:00:820 -- (41059152) Connection from: 74.6.135.125  -  Originating country : United States
07/09/18 20:27:00:898 -- (41059152) Received MAIL FROM: mailto:external@yahoo.com" rel="nofollow - external@yahoo.com
07/09/18 20:27:00:929 -- (41059152) Received RCPT TO: mailto:internal@domain.com" rel="nofollow - internal@domain.com
07/09/18 20:27:00:961 -- (41059152) Resolving 74.6.135.125 - sonic310-15.consmr.mail.bf2.yahoo.com
07/09/18 20:27:01:367 -- (41059152) Mail from: mailto:external@yahoo.com" rel="nofollow - external@yahoo.com
07/09/18 20:27:01:633 -- (41059152) - MAPS search done...
07/09/18 20:27:01:633 -- (41059152) RCPT TO: mailto:internal@domain.com" rel="nofollow - internal@domain.com accepted
07/09/18 20:27:01:711 -- (41059152) From header ( mailto:external@yahoo.com" rel="nofollow - external@yahoo.com ) matches MAIL FROM ( mailto:external@yahoo.com" rel="nofollow - external@yahoo.com )
07/09/18 20:27:01:727 -- (41059152) Email Subject: Re: test in
07/09/18 20:27:01:727 -- (41059152) Start CheckWL_Keywords
07/09/18 20:27:01:727 -- (41059152) End CheckWL_Keywords
07/09/18 20:27:01:727 -- (41059152) Checking SFDC
07/09/18 20:27:01:914 -- (41059152) Checking SFDE
07/09/18 20:27:02:180 -- (41059152) Checking SF0Day
07/09/18 20:27:02:180 -- (41059152) Start CheckBL_Keywords
07/09/18 20:27:02:211 -- (41059152) End CheckBL_Keywords
07/09/18 20:27:02:211 -- (41059152) EMail from mailto:external@yahoo.com" rel="nofollow - external@yahoo.com to mailto:internal@domain.com" rel="nofollow - internal@domain.com passes Bayesian filter - 0% spam  (0ms)
07/09/18 20:27:02:211 -- (41059152) Checking SURBL
07/09/18 20:27:02:211 -- (41059152) Checking URLs in emails against MAPS
07/09/18 20:27:02:211 -- (41059152) - URLs In MAPS search done...
07/09/18 20:27:02:258 -- (41059152) Starting queueing procedures
07/09/18 20:27:02:274 -- (41059152) EMail from mailto:external@yahoo.com" rel="nofollow - external@yahoo.com to mailto:internal@domain.com" rel="nofollow - internal@domain.com was queued (Indy239EB798-02A6-4137-9CC4-618D9CF10383.~tmp). Size: 3 KB, 3339 bytes
07/09/18 20:27:02:274 -- (41059152) Created thread (40200624) to handle delivery
07/09/18 20:27:02:274 -- (40200624) Sending email from mailto:external@yahoo.com" rel="nofollow - external@yahoo.com to mailto:internal@domain.com" rel="nofollow - internal@domain.com ---
07/09/18 20:27:07:449 -- (41059152) Starting bayesian procedures
07/09/18 20:27:07:449 -- (40200624) EIdSocketError - Socket Error # 10053 --- Software caused connection abort. - forwarding to:172.22.1.30:2551 - message queued - mailto:external@yahoo.com" rel="nofollow - external@yahoo.com to: mailto:internal@domain.com" rel="nofollow - internal@domain.com ---
07/09/18 20:27:07:558 -- (41059152) Disconnect

 

 

Hi mmmctune,

We had recently found a bug likely causing the issue you are experiencing. This was resolved in the latest SpamFilter v4.7.4.250 - can you please try upgrading to see if that was the cause?