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https://cromwell-intl.com/open-source/sendmail-ssl.html
SMTP over TLS/SSL . We want Sendmail to transfer mail through SMTP over TLS whenever possible for multiple security reasons. The obvious advantage is confidentiality.. The less obvious advantage for most people is authentication, ideally mutual authentication. You also get integrity, protection against malicious modification of the data stream. ...
https://www.sendmail.org/%7Eca/email/starttls.html
The rulesets tls_server and tls_client are used to decide whether an SMTP connection is accepted (or should continue). tls_server is called when sendmail acts as client after a STARTTLS command (should) have been issued. The parameter is the value of {verify}.
https://docs.oracle.com/cd/E36784_01/html/E36828/fxcty.html
How to Set SMTP to Use TLS. SMTP can use Transport Layer Security (TLS) in version 8.13 of sendmail.This service to SMTP servers and clients provides private, authenticated communications over the Internet, as well as protection from eavesdroppers and attackers.
https://www.howtoforge.com/howto_sendmail_smtp_auth_tls
Sendmail-SMTP-AUTH-TLS-Howto. Version 1.0 Author: Falko Timme . This document describes how to install a mail server based on sendmail that is capable of SMTP-AUTH and TLS. It should work (maybe with slight changes concerning paths etc.) on all *nix operating systems. I tested it …Author: Falko Timme
https://docs.oracle.com/cd/E36784_01/html/E36828/fvbrb.html
Support for Running SMTP With TLS in Version 8.13 of sendmail. Communications between SMTP servers and clients are not usually controlled or trusted on either end. This lack of security might allow a third party to monitor and even alter a communication between a server and a client.
https://serverfault.com/questions/346771/is-there-a-way-to-completely-disable-outbound-opportunistic-tls-support-in-sendm
CentOS 5.x SendMail 8.14.4. An overzealous network security feature is causing TLS negotiations to fail when my Sendmail server tries to talk to external hosts. This is causing sendmail to constantly requeue some messages because it won't fail over to unencrypted delivery. Is there a way to disable outbound TLS completely?
https://www.linuxquestions.org/questions/blog/mensawater-183304/rhel5-wont-support-tlsv1-1-or-higher-36951/
stat=Deferred: 403 4.7.0 TLS handshake failed The RHEL5 server is running Sendmail. It turns out that by default Sendmail is attempting secure connection based on TLS which of course is TLSv1.0 as noted in original blog post. The MS Admins have just disabled TLSv1.0 on the Hybrid servers.
https://groups.google.com/d/topic/comp.mail.sendmail/X4hyWvBKUIY
Few months ago I enabled TLSv1 only on Sendmail setting up the line -D_FFR_TLS_1 on site.config.m4 file and recompiled sendmail. Now there is a need to enable only TLSv1.2 and I am wondering if there is another option of -D_FFR_TLS_1 like -D_FFR_TLS_1_2 or something like this.
https://access.redhat.com/articles/1468393
Securing sendmail (sendmail-8.14.4-9.el6_8.1) that uses openssl This article is part of the Securing Applications Collection Securing sendmail with SSL/TLS on RHEL6 - …
https://www.linuxjournal.com/article/4823
Aug 15, 2001 · We will illustrate how to set up a TLS capable SMTP server using Sendmail 8.12 beta. Since version 8.11, Sendmail has been capable of natively using TLS security when it was compiled. This was, in fact, the major difference between versions 8.10 and 8.11. When compiled to support TLS transactions, it is often referred to as "Sendmail Secure ...
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