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https://cromwell-intl.com/open-source/sendmail-ssl.html
Sendmail-SMTP-AUTH-TLS Howto That page describes building and installing openssl , cyrus-sasl , and sendmail from source, with specific older versions explicitly coded into the commands. Use the packages included with your operating system distribution.
https://serverfault.com/questions/369343/does-sendmail-support-outbound-tls-encryption-without-additions-to-the-sendmail
2 Answers 2. I can confirm that I am seeing the same thing, independently; a sendmail installation with no certificates configured in is still taking advantage of TLS when sending to a server which advertises itself as supporting that protocol.
https://www.sendmail.org/%7Eca/email/starttls.html
This is what sendmail (using OpenSSL) does when it acts > as client and no client cert is available. > > The question is whether Eudora is broken and should respond with > an empty list too. It is broken, but the solution to Ed's problem is to simply disable TLS 1.0 support in Eudora.
https://luxsci.com/blog/who-does-not-support-smtp-tls-for-secure-inbound-email-delivery.html
While it is possible to tell who supports TLS, its is somewhat technical to do yourself. So, we have assembled a table with many of the popular free / public email domains in use across the Internet and indicate which currently (as of January 14th, 2015) support SMTP TLS …
https://luxsci.com/blog/how-to-tell-who-supports-tls-for-email-transmission.html
Just because a server supports TLS today, does not mean that it will tomorrow — server configurations can change and mistakes can be made. There are ways, however, to ensure that an email will never be sent to someone without TLS — see Enforcing Email Security with TLS …
https://serverfault.com/questions/159712/how-to-tell-sendmail-to-explicitly-not-try-tls-for-a-domain
CentOS 5.x Sendmail Hi Guys, I have sendmail setup to perform opportunistic TLS but would like to never use TLS when sending to a specific domain. Is there an entry I can add to /etc/mail/acc...
https://docs.oracle.com/cd/E36784_01/html/E36828/fxcty.html
The following procedure uses sample data to show you how to set up the certificates that enable sendmail to use TLS. For more information, see Support for Running SMTP With TLS in Version 8.13 of sendmail. Become an administrator.
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 …
https://www.linuxquestions.org/questions/blog/mensawater-183304/rhel5-wont-support-tlsv1-1-or-higher-36951/
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. Reading this morning confirmed if it fails TLS Handshake it does NOT fall back to simple text for SMTP relaying as one might think.
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_dep365-mso_o365b/smtp-server-doesnt-support-starttls/3bf73694-75f4-49e6-9bb8-baa8132677e5
May 04, 2017 · Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number.
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