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https://www.hmailserver.com/forum/viewtopic.php?t=23236
Dec 30, 2013 · 587 port is normally used by plain text service similar to SMTP. If your program chooses TLS for 587 automatically, then it is confusing TLS with StartTLS. hMailServer does not support StartTLS. When you setup service protected with SSL in hMailServer, you are setting up service protected with TLSv1.
https://www.hmailserver.com/documentation/v5.6/?page=reference_connection_security
If the remote peer does not support STARTTLS, or if the peers can not agree on a cryptographic protocol and cipher, hMailServer will fallback to a connection with no security. If the peers agree on a cryptographic protocol and cipher, but the certificate verification fails, the connection will be used despite the failed certificate verification.
https://github.com/hmailserver/hmailserver/issues/229
Aug 07, 2017 · The OLE DB Provider used by hMailServer does not support TLS 1.2, so simply stating that the connection should be encrypted won't work since the connection to a TLS 1.2 server will fail anyway. I have added an ini-file-setting which lets you override the provider to be used.
https://github.com/hmailserver/hmailserver/issues/186
Jul 03, 2016 · I was using hMailServer with TLS 1.0 which was working fine. But I need to update my server to use TLS 1.1 and TLS 1.2. After updating my server hMailServer is not working with TLS …
https://luxsci.com/blog/how-to-tell-who-supports-tls-for-email-transmission.html
How to Tell Who Supports SMTP TLS for Email Transmission SMTP TLS ( Transport Layer Security ) is the mechanism by which two email servers, when communicating, can automatically negotiate an encrypted channel between them so that the emails transmitted are secured from eavesdroppers.
https://www.hmailserver.com/documentation/latest/?page=reference_ssltls
If the remote peer does not support STARTTLS, or if the peers can not agree on a cryptographic protocol and cipher, hMailServer will fallback to a connection with no security. If the peers agree on a cryptographic protocol and cipher, but the certificate verification fails, the connection will be used despite the failed certificate verification.
https://ssl-tools.net/mailservers/hmailserver.com
Discover if the mail servers for hmailserver.com can be reached through a secure connection. To establish a secure connection a mail server has to offer STARTTLS (SSL), a trustworthy SSL certificate , support for the Diffie-Hellman-Algorithm to guarantee Perfect Forward Secrecy and must not be vulnerable against the Heartbleed attack.
https://serverfault.com/questions/678564/how-to-set-up-tls-on-hmailserver/678650
I have a Windows 2008 server, running hMailServer. Right now all my communication is unencrypted. I want to start using TLS. So now I've got myself a SSL certificate for my domain. This I did by creating a certificate request in IIS, which I uploaded to a CA (StartSSL, FWIW). I then downloaded and saved the certificate file in IIS.
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