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Some isp providers do block some ports known to be used by viruses. Its the spam protection that davebaldwin said plus the major reason of resources that sshah254 mentioned. <br />
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The other major issue that stop isps from protecting you is that there is no universal way to give certain protection. For example they might find something to be a virus but is not. They will mistakenly block it, &nbsp;thus making the life of the user difficult and complicated. <br />
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There is a rule that the internet is the 'wild thing' and you should be responsible for securing your own network by implementing security measures, such as firewalls, antiviruses, security policies and so on... 
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recently, someone said he emailed me on from his gmail account to my hotmail account, but i havent got his emails.<br />
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is it possible that his email got blocked somehow by hotmail server or something and i didnt receive it?<br />
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is it possible not to receive email?<br />
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im on hotmail.
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Gmail has a policy for attachements and they dont let you attach some types of file extensions such as .exe. <br />
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If your friend tried to attach an exe to the mail then probably it was blocked by the gmail server. Another thing is that your hotmail account has some sort of spam filtering. If the mail had something to mark it as spam then it was rejected, or moved to your junk mail folder. 
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i did check the junk folder but nothing was there.<br />
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it was just a document that he said, he got my email though.<br />
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what could be the problem? &nbsp;<br />
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or that he is lying????
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I don't know if he's lying or not but we talking about two services that are known to work well (gmail, hotmail) If he had an error sending you the mail then he definitely received a mail from gmail mailer daemon explaining the reason that his mail was rejected or blocked... <br />
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Some ISPs provide such service, usually know as clean pipe.
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Hotmail and Gmail and Yahoo are known to be more interested in blocking spam than delivering email. &nbsp;And they usually do not tell you if they blocked your email because they thought it was bad. &nbsp;It just goes away...
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so its possible that his email got blocked without any trace?
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what could be the possibilities?
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You could ask him to send it again or you could send him an email to see if it goes thru.
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This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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i want to know if an ISP can block viruses, worms and other attacks from occuring to the end users PC.<br />
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is it possible? if no, why not?<br />
<br />
<br />
since we are connected to the isp, we can be protected by them.<br />
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am i wrong??
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i want to know if an ISP can block viruses, worms and other attacks from occuring to the end users PC.

is it possible? if no, why not?


since we are connected to the isp, we can be protected by them.

am i wrong??

can ISPs act as a security perimeter to avoid attacks and viruses to its end users customers PC??

Operating system security (OS security) is the process of ensuring OS integrity, confidentiality and availability. OS security refers to specified steps or measures used to protect the OS from threats, viruses, worms, malware or remote hacker intrusions. OS security encompasses all preventive-control techniques, which safeguard any computer assets capable of being stolen, edited or deleted if OS security is compromised, including authentication, passwords and threats to systems and programs.

OS Security

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.

Network Security

Anti-virus software was originally developed to detect and remove computer viruses. However, with the proliferation of other kinds of malware, antivirus software started to provide protection from other computer threats. In particular, modern antivirus software can protect from malicious browser helper objects (BHOs), browser hijackers, ransomware, keyloggers, backdoors, rootkits, trojan horses, worms, malicious layered service providers (LSPs), dialers, fraud tools, adware and spyware. Some products also include protection from other computer threats, such as infected and malicious URLs, spam, scam and phishing attacks, online identity theft (privacy), online banking attacks, social engineering techniques, Advanced Persistent Threat (APT), botnets and DDoS attacks.

Anti-Virus Apps

Microsoft Forefront, formerly known as Internet Security and Acceleration Server (ISA Server), is a network router, firewall, antivirus program, VPN server and web cache that runs on Windows servers. It includes identity management and protection systems, and discontinued systems for threat management and network protection, along with protection for Sharepoint and Exchange. The scope of discussions includes forward and reverse proxy, application and service publishing, virtual private networks (VPNs), outbound access rules, SSL certificates and network routing within either a single node or an highly-available array pairing.