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What does Failed; 5.1.1 (bad destination mailbox address) mean?

If you receive an email from postmaster with the error message:

Failed; 5.1.1 (bad destination mailbox address)

This means that a message was sent from your address to an email address which does not exist.

If you send the message quoted in the email, then check the address before sending again.

If you did not send the message quoted in the mail, then another person may have sent the message using your address in the 'from' field.

Spam Analysis

Securelist / Analysis

IT Threat Evolution: Q1 2013
- According to KSN data, Kaspersky Lab products detected and neutralized 1 345 570 352 threats in Q1 2013.
- A total of 22,750 new modifications of malicious programs targeting mobile devices were detected this past quarter - that’s more than half of the total number of modifications detected in all of 2012.
- Some 40% of the exploits seen in the first quarter of this year target vulnerabilities in Adobe products.
- Nearly 60% of all malicious hosts are located in three countries: the US, Russia, and the Netherlands.
Spam in Q1 2013
The percentage of spam in total mail traffic was up by 0.5 percentage points in the first quarter, averaging 66.5%.
Spyware. HackingTeam
This article is based on technical data from KL experts and their analysis of the Korablin and Morcut malicious programs. A number of conclusions based on open source data.
Spam in March 2013
The percentage of spam in email traffic was down 1 percentage point compared with February and averaged 70.1%
Winnti. More than just a game
The study shed light on the activities of a group that has persistently targeted online gaming companies for several years.
Winnti 1.0 technical analysis
The favorite tool of the attackers has been malicious program we called "Winnti". It has evolved since the first use, but we divide all variants into two generations: 1.x and 2.x. Our publication describes 1.0 variant of this tool.
Spam in February 2013
The percentage of spam in email traffic was up 12.8 percentage points compared with January and averaged 71.1%.