* Christof Meerwald via mailop <cme...@cmeerw.org>: > On Wed, Sep 30, 2020 at 09:15:05AM +0100, Tim Bray via mailop wrote: > > Should it be using TLS for outbound connections? I'm not seeing that? > > > > (no problem if that is something you just haven't turned on yet. And thanks > > for sorting this all out) > > > > Received: from mx.mailop.org ([2a03:4000:37:599:d8ce:dff:fee1:81c2]) > > by herm.doylem.co.uk with esmtps (Exim 4.92 #3 (Debian)) > > id 1kNWO9-0005Hf-1Y > > Doesn't "esmtps" indicate TLS? > > This is what I am seeing: > > Received: from mx.mailop.org ([91.132.147.157]) > by path.cmeerw.net with esmtps (TLS1.3) tls > TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 > (Exim 4.94) > > but for some reason it's using IPv4 instead of IPv6...
Other messages sent to you have been delivered using IPv6: Sep 30 11:42:24 mx postfix/smtp[26273]: 4C1WVN17drz8slt: to=<cme...@cmeerw.org>, relay=path.cmeerw.net[2a04:92c7:2:318::c001:c0de]:25, delay=53, delays=36/4.5/1.4/10, dsn=2.0.0, status=sent (250 OK id=1kNYcy-00G81a-Jh) In general Postfix does not prefer one protocol over the other. It tries whatever works. If, for some reason, IPv6 did not work on first attempt, it falls back to IPv4. p@rick -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG,80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer, Wolfgang Stief Aufsichtsratsvorsitzender: Florian Kirstein
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