Send email with TLS encryption

[mkz_s]

Hi,

I run in my company a Zimbra server which serves as email server for 4 different domains. It has come to our attention that gmail recipients see this when getting an email from us:



(rima-tde.net is our ISP's, telefónica, PTR name for the server IP address)

The gmail more information link (https://support.google.com/mail/answer/ ... hl=es&rd=1) tells me that our email is being sent without TLS encryption.

As I undesrtand, in order to encrypt sent messages, I would have to set a certificate for each email domain in ZimbraAdmin > Configure > Domains > domain.com > Certificates, right?

I have tried to save there our certbot letsenctypt certificate for each domain, but I am getting the following error:



In the domain certificate field I've tried with the cert.pem alone and the fullchain.pem, both with same error.

Is there anything I am missing?

I kindly ask for your help.

If this post should be in a different subforum I'd be happy to move it.

Thanks a lot.

[mkz_s]

Just a little bump.

[L. Mark Stone]

Just a little bump.

For information on provisioning domain certificates, to support Virtual Hosts, please reference:

Code: Select all

https://wiki.zimbra.com/wiki/Multiple_SSL_Certificates,_Server_Name_Indication_(SNI)_for_HTTPS

(Putting the link as a code block because the forum weblink parser doesn't deal with parenthesis in a URL accurately.)

FWIW, I don't use the Admin Console to do this, only the CLI.

Hope that helps,
Mark