I’m going to make an assumption here and say this is because the list sends your email out but with your email address in it. Therefore this procedure interferes with the email envelopes and specifically the SPF record for your email address.
SPF is ‘sender policy framework’ and is a method used to authenticate that email originates from a legitimate server for that domain. A list service like this mangles the server of course because it is forwarding your email to everyone on the list from its own email server. Example: When a user ([email protected]) posts to the list (my.mailinglist.com), the outbound message from the list server has the envelope sender set to "[email protected]". The list server then relays the outgoing message to, say, mail.gateway.com, which then delivers it over the Internet. When the SMTP server at somewhere.org (or other domain) receives the post, it sees that it was sent by the relay, mail.gateway.com (13.14.15.16), which does not have its IP address on the SPF record for somewhere.org. Hence the flag is raised that the sender might not be who they say they are, which technically is correct so you see the prompt. This may need some IT gurus faffing about to sort out... Regards, Matthew Wilson, Technical Director, GB Electronics (UK) Ltd. From: Edward Price [mailto:[email protected]] Sent: 06 March 2018 01:42 To: [email protected] Subject: [PSES] The Spoofee Hi Listmembers: Recently, all of my list posts have been prefaced with this courteous little warning: This sender failed our fraud detection checks and may not be who they appear to be. Does everyone receive this warning, or is it just on the copy distributed to me? My IT Manager (my grandson) says that this could happen if the IEEE doesn’t have the most recent security certificates applied to their mail server. Please reply off-list if you have a comment, as 700 “yes” or “no” answers would probably damage today’s S/N ratio. Ed Price WB6WSN Chula Vista, CA USA - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]<mailto:[email protected]>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<mailto:[email protected]>> ________________________________ Matthew Wilson Technical Director [GBE]<https://gbelectronics.uk> https://gbelectronics.uk T: +44 (0)1903 244500 F: +44 (0)1903 700715 Ascot House // Mulberry Close // Woods Way Goring-by-Sea // West Sussex // BN12 4QY // UK Electronics Design // Manufacturing // Component Distribution [ISO 9001 | ISO 14001] <https://gbelectronics.uk/quality/standards> Want to send us a file? https://www.mailbigfile.com/gbelectronics ________________________________ GB Electronics (UK) Limited is a company registered in England and Wales Company Registration No: 06210991 VAT Registration No: GB 925 1744 25 Registered Office: Ascot House, Mulberry Close, Woods Way Goring by Sea, West Sussex, BN12 4QY Disclaimer: This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please delete it from your system, do not use or disclose the information in any way and notify the sender immediately. The contents of this message may contain personal views which are not the views of the company, unless specifically stated. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
