Hi all, Just wanted to share some insights after using the ECC certificates on a few MTAs over the past month. I only did see problems with sending Cisco ESA's, which don't have ECC certificate support enabled for outbound traffic in their default configuration as it seems: https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/200169-Configure-ESA-to-prefer-Perfect-Forward.html#anc8
Other sending MTAs did not pop up to my attention so far. Regards Norbert -----Ursprüngliche Nachricht----- Von: mailop <mailop-boun...@mailop.org> Im Auftrag von Fehlauer, Norbert via mailop Gesendet: Montag, 18. November 2024 23:00 An: mailop@mailop.org Betreff: Re: [mailop] ECC Certificate for SMTP TLS Hi, thanks to all that answered my question. I guess I'm going one MTA with ECC only and one with RSA certificate and keep an eye on the logs. Inbound-problems should either reflect in the TLS reports or the plaintext delivery should rise and outbound delivery should generate errors/NDRs. Dual cert use seems complex and on the other hand our servers don't support that. Regards Norbert
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