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https://issues.apache.org/jira/browse/JAMES-3209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17132731#comment-17132731
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Ioan Eugen Stan commented on JAMES-3209:
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Yes [~dleangen],  both are valid solutions IMO. 

What we seem to need is SNI and it looks like it is available since Java 8 
according to  https://openjdk.java.net/jeps/114 .

There is also this library that does SNI and might help us 
https://github.com/marianobarrios/tls-channel . 60KB, only SLF4j as dependency, 
delegates to java SSLEngine .

> Auth Module to make James usable with Nginx mail proxy for TLS termination 
> ---------------------------------------------------------------------------
>
>                 Key: JAMES-3209
>                 URL: https://issues.apache.org/jira/browse/JAMES-3209
>             Project: James Server
>          Issue Type: New Feature
>            Reporter: Ioan Eugen Stan
>            Priority: Major
>
> Apache James needs to be deployed with TLS encryption to ensure security of 
> emails during transport. 
> We could use Nginx as a mail proxy and use it for TLS termination. 
> However we need to implement an HTTP auth service for that to work. 
> This issue should cover work on making Nginx a valid mail proxy in front of 
> Apache James.
> References:
> https://docs.nginx.com/nginx/admin-guide/mail-proxy/mail-proxy/ 
> https://nginx.org/en/docs/mail/ngx_mail_auth_http_module.html#protocol
> == Context
> Unfortunately, Java has only the keystore for managing TLS certificates. This 
> is makes deploying TLS certificates hard for Apache James since the internet 
> does not use. keystore format. 
> We could use Nginx as a amil proxy. Nginx supports the certificate format 
> that all other tools use. (add format here - PKCS #XXX ). People know how to 
> setup Nginx with LetsEncrypt and benefit from free TLS certificates with 
> automatic renewal. 
> However we need an integration piece: the nginx auth service. It's an http 
> service that works only with headers. It should be simple to write and work 
> integrate.



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