![]() Imagine all this data being copied and pasted from each MTA to the next, in succession until the message reaches the inbox. This information includes the SMTP headers you're familiar with, the message, and its attachments. The message portion begins when the data command is issued. This doesn't usually affect the "display of addresses" in the mail client, but there are occasions where MTAs will display this field (if the RFC2822 headers are corrupt). It is used for "to" and "bcc" users alike. ![]() The RCPT TO: is who the message is actually being sent to. If a message is coming from Postmaster or a remailer service this is usually or It's interesting to see that salesforce uses this similar to constantContact as a key in a database like to see if the message bounced. The RCPT From: is where the NDRs will go. It disappears when the message goes to the next MTA. The envelope is metadata that doesn't appear in the SMTP header. One is known as the RFC2821 Envelope, the other is the RFC2822 Message. Microsoft attempted to solve this issue with SenderID, (making SPF apply to the Display From address) but it was too complicated and didn't really solve the whole problem.įirst know that there are two "from" addresses and two "to" addresses in every SMTP message. By default, the usefulness of SPF is to prevent backscatter issues and very simple spoofing scenarios.SPF alone doesn't affect, influence or, control the RFC 2822 Display From.There are a few misconceptions about SPF, namely: The email client (MUA) should display this exception whenever it exists. The email protocol allows for legitimate spoofing using Resent-* headers and Sender headers. The email client is responsible for telling you if the message passes DMARC Display From verification The solution is to use DKIM + DMARC, or SPF + DMARC It's very easy to spoof a domain even with SPF controls enabled.
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