![]() The result is that the email recipient sees the email as having come from the address in the From: header. Reply-to: Jane Roe - similarly not checked.From: Joe Q Doe - the address visible to the recipient but again, by default no checks are done that the sending system is authorized to send on behalf of that address.Unless the receiving mail server signals that it has problems with either of these items, the sending system sends the "DATA" command, and typically sends several header items, including: ![]() Together, these are sometimes referred to as the "envelope" addressing – an analogy to a traditional paper envelope. RCPT TO: - specifies which email address the email is delivered to, is not normally visible to the end user but may be present in the headers as part of the "Received:" header.MAIL FROM: - generally presented to the recipient as the Return-path: header but not normally visible to the end user, and by default no checks are done that the sending system is authorized to send on behalf of that address.When a Simple Mail Transfer Protocol (SMTP) email is sent, the initial connection provides two pieces of address information: Individuals and businesses deceived by spoof emails may suffer significant financial losses in particular, spoofed emails are often used to infect computers with ransomware. More recent countermeasures have made such spoofing from internet sources more difficult but they have not eliminated it completely few internal networks have defences against a spoof email from a colleague's compromised computer on that network. ![]() ![]() The original transmission protocols used for email do not have built-in authentication methods: this deficiency allows spam and phishing emails to use spoofing in order to mislead the recipient. Disposable email address or "masked" email is a different topic, providing a masked email address that is not the user's normal address, which is not disclosed (for example, so that it cannot be harvested), but forwards mail sent to it to the user's real address. The term applies to email purporting to be from an address which is not actually the sender's mail sent in reply to that address may bounce or be delivered to an unrelated party whose identity has been faked.
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