On Wednesday, 6 November 2019 00:39:43 GMT Dale wrote: > Grant Taylor wrote: > > On 11/1/19 2:00 PM, Dale wrote: > >> I think we came to the conclusion that one person is causing this. > > > > I don't agree with that conclusion. > > The only message I noticed missing was from one person. Since they are > coming from one person, that is the cause. If the messages was from > more than one person, then maybe there could be another conclusion.
Correlation does not equal causation. Any one having similar email headers could cause a message to be flagged as spam, or to be rejected by the recipients mail server. Thankfully the M/L informs us messages from the list to us were bounced and we can look at the online M/L archives to see what the message might have been. Some email ISP services are not as obliging though - see below. ANECDOTAL OBSERVATIONS: I've noticed recently even using the same sender address, but a different mail client, could cause the difference between the message being accepted or rejected by the recipient's mail server. I had to send an innocuous message containing only plain text and a couple of URLs to a group of senders, with their individual addresses in BCC: to ensure they remained anonymous among themselves. Two of the recipients' mail servers bounced my message with a "554 Message Rejected". I tried again, this time sending the same message body, with the same email client (KMail) to each of the two recipients individually. Same deal: "554 Message Rejected" from both. Then I used the Gmail webmail GUI to send the same message body to each recipient and to my surprise it was accepted by their mail server and delivered to their Inbox. Until that point they were none the wiser of my repeated attempts to email the information they had requested. Using KMail configured to use smtp.gmail.com Vs using Gmail's webmail generates slightly different headers and I surmised this is all there was to my message being rejected in the first two attempts. -- Regards, Mick
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