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It is possible your ISP gave you an IP from a range that had been blocked previously. That happened to me (some years back) so that I was unable to send/receive in some instances. It has long since been fixed. <br />
<br />
You can also use MXTOOLBOX (above) to check your IP range. <br />
<br />
Can you try the computer in a different network environment?
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It is possible your ISP gave you an IP from a range that had been blocked previously. That happened to me (some years back) so that I was unable to send/receive in some instances. It has long since been fixed.

You can also use MXTOOLBOX (above) to check your IP range.

Can you try the computer in a different network environment?

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You'll need to find out your public IP address first (<a href="http://www.whatismyip.com" rel="ugc">www.whatismyip.com</a>), or at least the public IP address of the physical location of where your mail server resides.<br />
<br />
Once you have the public IP address of your mail server you can check on MXToolBox as noted above: <a href="http://mxtoolbox.com/blacklists.aspx" rel="ugc">http://mxtoolbox.com/blacklists.aspx</a><br />
<br />
While having your IP address on a blacklist would explain why you can't send out emails to certain addresses, it doesn't necessarily explain why you can't <b>receive</b> some emails.
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You'll need to find out your public IP address first (www.whatismyip.com [http://www.whatismyip.com]), or at least the public IP address of the physical location of where your mail server resides.

Once you have the public IP address of your mail server you can check on MXToolBox as noted above: http://mxtoolbox.com/blacklists.aspx [http://mxtoolbox.com/blacklists.aspx]

While having your IP address on a blacklist would explain why you can't send out emails to certain addresses, it doesn't necessarily explain why you can't receive some emails.

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Hi all,<br />
<br />
for some reason when I use my principal email address sometimes to certain users I can neither send nor receive any mail from them. It seems that my email is on some blacklist somewhere. In such cases what does one do?<br />
<br />
thanks in advance
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Hi all,

for some reason when I use my principal email address sometimes to certain users I can neither send nor receive any mail from them. It seems that my email is on some blacklist somewhere. In such cases what does one do?

thanks in advance

How do I find out if my email address is on any known blacklist and if so how do I remove it?

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.

Internet / Email Software

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. 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.

AntiSpam

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.