Mail Submission Protocol

Jeroen van Aart jeroen at
Tue Apr 27 19:55:57 CDT 2010

Raoul Bhatia [IPAX] wrote:
  > i recently had the problem that an lotus notes server insisted on
> sending emails to one of our clients via port 465. so having mandatory
> authentication there actually broke delivery for an exchange sender.

Leave it "broken" for the other end that is. Only way to force them to 
fix it.

The only acceptable, and standard, way to submit email these days is 
using port 587 with TLS. And if you have users with broken clients, they 
can use webmail behind https. I am against facilitating (and thus 
perpetuating the existence of) old broken clients by making available 
port 465.



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