451 TLS/SSLv3 Connection required

HCL Domino Domino Forum
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I have a message stuck in one of my mail.box files. I suspect one of our customers sent someone a calendar invite and it’s trying to reply with his acceptance. We route everything through Message Labs

IBM Domino (r) Server (64 Bit) (Release 9.0.1FP8 for Windows/64) 03/15/2018 07:28:22 AM

03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: Attempting to Connect: Host mail95.MESSAGELABS.COM, Port 25, SSL Port 0, Connecting Domain internotes.dekko.com
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: Connection successful
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: ReceiveResponse: 220 ****************************************
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: CommandEHLO: EHLO internotes.dekko.com
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: ReceiveResponse: 250-server-15.tower-95.messagelabs.com
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: ReceiveResponse: 250-STARTTLS
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: ReceiveResponse: 250-PIPELINING
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: ReceiveResponse: 250 8BITMIME
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: SMTP Authentication is not required by local server. Username: -blank-
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: Attempting to SubmitMessage:
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: Pipelined commands:
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: MAIL FROM:<thisfinegentleman@cummins dot com>
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: RCPT TO:<thisfinegentleman@cummins dot com>
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: DATA
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: End of pipelined commands
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: ReceiveResponse: 250 OK
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: ReceiveResponse: 451 TLS/SSLv3 Connection required. (#4.7.1)
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: CommandRSET:
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: Attempting to Disconnect:
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: CommandQUIT:
03/15/2018 07:18:19 AM [1668:0010-1A68] SMTPClient: Connection terminated with status: 2562

2

Subject: fix for: 451 TLS/SSLv3 Connection required

IBM had me open the server document. Ports, Internet Ports, Mail and change Mail (SMTP Outbound) Port 25 TCP/IP Port Status from Enabled to Negotiated SSL.

After doing that:

RESTART TASK SMTP

(… wait…)

RESTART TASK ROUTER

(… wait …)

Mail was no longer stuck in the mail.box file.