On 23 Jan 2020, at 15:18, Pete Resnick wrote:

On 23 Jan 2020, at 5:18, Benny Kjær Nielsen wrote:

In a perfect world, only ports 25, 143 and 587 would exist.

Actually, current guidance is to go for the implicit TLS ports (465 and 993). See https://www.rfc-editor.org/rfc/rfc8314.html#section-3.

I was unaware of this official reversal of recommendations. I should probably also have been less specific and just written:

In a perfect world, only 1 set of ports would exist ;-)

--
Benny
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