Only when I checked with my supplier after a week of my transfer, I realized I was cheated by a fraudster. When I check the emails, I find out that the email used by the fraudster is a completely different email address than my supplier’s email address. It has never been involved in the whole thread until the fake invoice was sent. But my supplier said that that email address was very much similar to email address of his daughter except his daughter ‘s email contain an extra zero in it.
The local-part postmaster is treated specially—it is case-insensitive, and should be forwarded to the domain email administrator. Technically all other local-parts are case-sensitive, therefore [email protected] and [email protected] specify different mailboxes; however, many organizations treat uppercase and lowercase letters as equivalent. Indeed, RFC 5321 warns that "a host that expects to receive mail SHOULD avoid defining mailboxes where ... the Local-part is case-sensitive".
By processing email, I mean that email directed at some address “@” (at) one of those domains is handled by a mail server or servers specifically for that domain. In fact, all the internet really knows is that “mail for this domain is is handled by that server”. Sometimes it’s the same server as the web site – for example, as I write this, mail for “askleo.com” is handled by “askleo.com”. But sometimes it’s not – mail for “hotmail.com” is actually handled by four different servers, “mx1.hotmail.com” through “mx4.hotmail.com”.
As I said, you probably know what a domain is. “askleo.com” is a domain, as is “hotmail.com”, “microsoft.com”, and “mac.com”. Those represent business or organizations on the internet. In almost all cases, they happen to have a web site associated with them, though it’s not technically required. Similarly, they all probably process email, though again, that is not necessarily required.
What about the time you clicked on that PayPal link that wasn't really a PayPal link? "Phishing" is a term applied to either websites or emails that pretend to be something they're not in hopes of getting a user to click on something they should have ignored. This tactis is done in hopes of then getting users to provide confidential information they would have otherwise kept to themselves, typically like passwords, financial information, or other personal data. While there are security measure that fight this, the mechanics behind phishing are, unfortunately, also consistently becoming more sophisticated. Even some dedicated antivirus and business-class hosted endpoint protection suites are having trouble keeping up.
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