> > Probably not. Once I turn off my ECC certificate on the smtpd, mail
> > goes through. So it's entirely certificate type related (RSA works,
> > ECC doesn't)
> 
> You can provide both certificates. I forgot which MTA are you using, but
> exim can do it (my bank requires RSA).

I know. 

Once I present both, mimecast is failing.
Once I present just the ECC certificate, mimecast is failing.
Once I present ONLY the RSA certificate, all is well.

-- 
Ralf Hildebrandt
Charité - Universitätsmedizin Berlin
Geschäftsbereich IT | Abteilung Netz | Netzwerk-Administration
Invalidenstraße 120/121 | D-10115 Berlin

Tel. +49 30 450 570 155
[email protected]
https://www.charite.de
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