Re: Adding a header on incoming mail, unintended consequences?
On 14/02/22 15:27, John Levine wrote: It appears that joea- lists said: So, back to my pondering. If I were, via some means, to add "Reply-To: The-right-list" this should solve the problem described above. However my "email foo (as distinct from "email fu" stops well short of knowing what this might break upon replying with this doctored header. That is, will it cause "breakage" of certain SPAM/Malware checks, or email tamper detectors. List software does that all the time. It won't cause any problems that you don't already have from the routine changes that lists do. Modifying headers has the potential to break DKIM signatures. But as long as you have done your own DKIM checks (if any) prior to adding the header, and you aren't forwarding the modified emails to external addresses then you should be fine. To put it another way: If you are forwarding emails to another domain (e.g. with .forward files), and the original email had a DKIM signature incorporating the Reply-To header, which has been invalidated as a result of your adding/changing the Reply-To header, then the forwarded email may be blocked (e.g. by DMARC), or could result in a higher SPAM score, which could cause the email to be treated differently? Nick.
Re: Adding a header on incoming mail, unintended consequences?
It appears that joea- lists said: >So, back to my pondering. If I were, via some means, to add "Reply-To: >The-right-list" this should solve the problem described above. >However my "email foo (as distinct from "email fu" stops well short of knowing >what this might break upon replying with this doctored header. >That is, will it cause "breakage" of certain SPAM/Malware checks, or email >tamper detectors. List software does that all the time. It won't cause any problems that you don't already have from the routine changes that lists do. -- Regards, John Levine, jo...@taugh.com, Primary Perpetrator of "The Internet for Dummies", Please consider the environment before reading this e-mail. https://jl.ly
Adding a header on incoming mail, unintended consequences?
I was pondering adding a header item on certain incoming mail. Specifically mail from some lists that do not arrive with an explicit "Reply-To: Some-list". One might ask why? Well certain older email clients (MUA's?) choose to, upon a "reply" to select the address of the person that posted to the list, while for those lists that contain the "Reply-to:" header item, it will select the list. This forces one to remember to choose "reply all" (or some equivalent) and delete the extraneous address. Simple matter, or so one might think. Not asking, by any stretch, for any list to reconfigure their end, just for this situation. So, back to my pondering. If I were, via some means, to add "Reply-To: The-right-list" this should solve the problem described above. However my "email foo (as distinct from "email fu" stops well short of knowing what this might break upon replying with this doctored header. That is, will it cause "breakage" of certain SPAM/Malware checks, or email tamper detectors. PS. Yes, I am considering "modernizing". But you know how old folks can be. joe a.
