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No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) as opposed to not rejecting all spam (false negatives) – and the associated costs in time, effort, and cost of wrongfully obstructing good mail.Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.Historically, reporting spam in this way has not played a large part in abating spam, since the spammers simply move their operation to another URL, ISP or network of IP addresses.
Similarly, when forwarding messages to a number of recipients who don't know one another, recipient addresses can be put in the "bcc: field" so that each recipient does not get a list of the other recipients' email addresses.
Address munging is the practice of disguising an e-mail address to prevent it from being automatically collected in this way, but still allow a human reader to reconstruct the original: an email address such as, "[email protected]", might be written as "no-one at example dot com", for instance.
Similarly, many spam messages contain web links or addresses which the user is directed to follow to be removed from the spammer's mailing list – and these should be treated as dangerous.
In any case, sender addresses are often forged in spam messages, so that responding to spam may result in failed deliveries – or may reach completely innocent third parties.
If they do accept a message, they will typically then analyze the content further – and may decide to "quarantine" any categorised as spam.
A number of systems have been developed that allow domain name owners to identify email as authorized.Further, contact forms have the drawback that they require a website with the appropriate technology.Many modern mail programs incorporate web browser functionality, such as the display of HTML, URLs, and images.A related technique is to display all or part of the email address as an image, or as jumbled text with the order of characters restored using CSS.A common piece of advice is to not to reply to spam messages as spammers may simply regard responses as confirmation that an email address is valid.Nowadays, with quickly development of the e-commerce websites, forums and social networks, the products, people, organizations or wonders are targeted of comments or reviews of the network communities.Many people often use that reviews to make their decision on something.in the US to the email address ( There are now a large number of applications, appliances, services, and software systems that email administrators can use to reduce the load of spam on their systems and mailboxes.In general these attempt to reject (or "block"), the majority of spam email outright at the SMTP connection stage.Avoiding or disabling this feature does not help avoid spam.It may, however, be useful to avoid some problems if a user opens a spam message: offensive images, being tracked by web bugs, being targeted by Java Script or attacks upon security vulnerabilities in the HTML renderer.