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MTAs supporting TLS with ECC

Andreas Bux

Hi there,

 

I was wondering if anybody could estimate if the use of an elliptic curve certificate for mail TLS is supported by the most MTAs?

We gave that a try about 2 years ago but rolled back to an RSA cert because much MTAs dropped the connection.

 

I also did not find any statistics about the usage of that.

 

Kind regards,

Andi



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  • ## UPDATED ##

    Hi Andi,

    I'm testing it at the moment and at this moment I encounter serious problems with the exim mta @ the utm.

    Result is no tls possible yet.

    Support case is created. When a solution is there I'll post the feedback.

    # UPDATE 10 September 2020 #

    Currently a support case is created. Preliminary research pointed out the following:

    current exim version does not support ECC at all. (https://bugs.exim.org/show_bug.cgi?id=1397)

    Errors in the smtp.log will show the following:

    error:1408A0C1:SSL routines:ssl3_get_client_hello:no shared cipher

    TLS client disconnected cleanly (rejected our certificate?)

    This is supposed to go direction GES/DEV in a short while. 

    I'll keep you updated on this.

     

     

    Regards,

     

    Arno

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  • ## UPDATED ##

    Hi Andi,

    I'm testing it at the moment and at this moment I encounter serious problems with the exim mta @ the utm.

    Result is no tls possible yet.

    Support case is created. When a solution is there I'll post the feedback.

    # UPDATE 10 September 2020 #

    Currently a support case is created. Preliminary research pointed out the following:

    current exim version does not support ECC at all. (https://bugs.exim.org/show_bug.cgi?id=1397)

    Errors in the smtp.log will show the following:

    error:1408A0C1:SSL routines:ssl3_get_client_hello:no shared cipher

    TLS client disconnected cleanly (rejected our certificate?)

    This is supposed to go direction GES/DEV in a short while. 

    I'll keep you updated on this.

     

     

    Regards,

     

    Arno

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