On Sun, Aug 15, 2021 at 09:27:28PM +0200, Matus UHLAR - fantomas <uh...@fantomas.sk> wrote:
> > On Sat, Aug 14, 2021 at 02:43:29PM +0200, Matus UHLAR - fantomas > > <uh...@fantomas.sk> wrote: > > > > > - dedicated port for smtp/ssl was deprecated (in fact never standrdized) > > On 15.08.21 09:04, raf wrote: > > I think that used to be true, but they had a rethink. > > > > This proposed standard (Jan 2018) indicates so: > > > > 3.3. Implicit TLS for SMTP Submission > > https://www.rfc-editor.org/rfc/rfc8314.html#section-3.3 > > this is for submission. Yes. It's the TLS-only alternative (submissions aka smtps) to STARTTLS on port 587 (submission). > I'm not exactly sure what was the original supposed > usage, but many providers started using it for implicit-ssl submission and > it stayed like this and was standardized like this... I heard (probably on this list) that the original usage was Outlook clients submitting mail (presumably to Windows mail servers?). cheers, raf
