Hi Wietse, Very good question! >From my point of view I'd like to have the ability to chose whether to enable >this filtering option (separately from the existing IP filtering), acknowledging the risks of mail loss (with a "Here be dragons" warning in the documentation).
If you are interested I can send a patch with a new config option. Many thanks, Nik Kostaras -----Original Message----- From: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] On Behalf Of Wietse Venema Sent: 11 September 2017 16:57 To: Postfix users <postfix-users@postfix.org> Subject: Re: smtpd_discard_ehlo_keyword_address_maps support for hostnames Nik Kostaras: > Hi all, > > Postfix documentation mentions (for smtpd_discard_ehlo_keyword_address_maps): > > ?The tables are not searched by hostname for robustness reasons.? > > Is it possible to describe what these reasons are? (performance > related?) Ask the question: if DNS lookup does not work, even if only for a brief time, would that result in the loss of mail? The purpose of this feature is to prevent a server from announcing a feature to an SMTP client, for example because it would result in the loss of mail (a client has a problem with that feature). What should happen: a) Don't suppress keywords based on hostname, and risk losing mail. b) Don't accept mail, to avoid loss of mail. c) Something else? Wietse ---------------------------------------------------------------------------------------------- Message Processed by the Clearswift R&D Dogfood Secure Email Gateway V4.7.0 This e-mail and any files transmitted with it are strictly confidential, may be privileged and are intended only for use by the addressee unless otherwise indicated. If you are not the intended recipient any use, dissemination, printing or copying is strictly prohibited and may be unlawful. If you have received this e-mail in error, please delete it immediately and contact the sender as soon as possible. Clearswift cannot be held liable for delays in receipt of an email or any errors in its content. Clearswift accepts no responsibility once an e-mail and any attachments leave us. Unless expressly stated, opinions in this message are those of the individual sender and not of Clearswift. This email message has been inspected by Clearswift for inappropriate content and security threats. To find out more about Clearswift’s solutions please visit www.clearswift.com
