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How come I can't receive email from some people and yet OK with others?

In today's SPAM burdened Internet environment, there can be many causes to legitimate emails not being delivered to their intended recipients! As of mid 2011, it is estimated that up to 60% of ALL Internet traffic is taken up by SPAM! Although recent developments in Anti-Spam Control Technologies have helped somewhat in reducing total SPAM traffic, it still has a long-way to go in eliminating SPAM altogether, if that's possible at all!

Today, ISPs and Email Services Providers use many different techniques to combat SPAM. Of the most common techniques, are IP based, Message Content based, and Embedded URIs based. These techniques are quite effective in reducing SPAM, however, determined spammers are very resourceful and are often able to devise clever ways to circumvent some of these detection techniques. It's a seemingly never ending cat-and-mouse game.

In using these SPAM detection techniques, it is inevitable that some legitimate emails will be falsely identified as SPAM (false positives). Of the three common techniques mentioned above, IP based detection is the most restrictive and unforgiving, while the remaining two are often combined with other techniques in a layered approach where an email message is tagged with a score by each detection filter in a chain, with the final SPAM score being the total sum of all tagged scores. If this SPAM score exceeds a predefined total (usually a setting controlled by email administrators or even individual users), the message is rejected, otherwise it passes through and gets delivered to its intended recipients.

How ISPs and Email Services Providers implement these SPAM detection techniques varies drastically and sometimes depends greatly on how strict a particular provider adheres to their SPAM Policy. In general, most providers employ a front-end IP Address Blacklisting filter followed by a combination of other content and protocol based filters to assess the likelihood of an email message being SPAM.

Depending on how this front-end IP Address Blacklisting filter is implemented, the resulting action can range from a simple SPAM Tag score added to the email message, to the worst case scenario in which it can prevent someone from sending any email through a Blacklisted Email Server to recipients whose email accounts are hosted on the network provider utilizing this particular IP Blacklisting filter.

This type of IP Address Filtering often manifest in someone unable to receive any email from people who are sending emails through an email server whose IP address is on a Blacklist used by the receiving email server's IP Address Filter.

Unfortunately, many IP Blacklist Filter implements a "Guilty Until Proven Innocence!" strategy, resulting in EVERYONE who's using a blacklisted email server to send email being unable to send emails to anyone using an email server implementing this particular IP Address Filter! This will happen even if it's ONLY a single user account on the offending email server that's abusing the system and using it to send out SPAM, whether the owner of that user account is aware of it or not!

Then, how can someone get their blacklisted email server off of Blacklists so that they can send emails again to servers using these Blacklists?

There are many Blacklists available on the Internet. Some are more popular than others. Some will reset an IP Address's Blacklisted status after a grace period of NO SPAM being detected as coming from that offending IP address, while others require the administrator of the offending email server contact a particular Blacklist's maintainer to provide proof that all SPAM activities have terminated at the offending server!

Like most ISPs, Bloomland's Email Services platform also employs a combination of IP Address Blacklist Filters and other content and protocol based analysis techniques to combat SPAM. In order to protect Bloomland's networks and its users from SPAM and other security threats, once an offending email server has been Blacklisted by multiple trusted Blacklists, ALL emails coming from that server will be silently dropped. Again, emails from such email server are dropped ONLY if its IP addresses appear on multiple trusted Blacklists!

It is up to the offending server's administrator to remove its IP Addresses from these Blacklists because it is logistically and financially impossible for Bloomland to request removal of email servers' IP addresses, that DO NOT belong to Bloomland, from these lists since Bloomland does not have control over these offending IP addresses' networks or their users!

If you suspect that emails from your acquaintances are being dropped because of IP Address Blacklist Filtering, please inform your acquaintances or their email servers administrators of possible IP Blacklist issues so that they may remedy the problems as soon as possible.

On way to quickly determine if your acquaintances' email servers' ip addresses are on these Blacklists is to use one of many IP Blacklist Checking websites available on the Internet. One such site is:


Of course, this requires that you know or have ways of finding out your acquaintances' email servers' ip addresses or domain names (e.g.: or ""). Information on how to find an email server's ip or its domain name is beyond the scope of this FAQ.

Well, I do understand that fighting SPAM is important, but I'm still not getting important emails from my acquaintances that are vital to my business, and that's even more important to me!

Why can't Bloomland just simply open their email servers to these Blacklisted servers just temporarily so I can at least get my all important emails?

The answer is simple. The needs of the many, out weight the needs of the one! If Bloomland knowingly allows emails from an email server that's been Blacklisted by multiple trusted Blacklists, and this action results in causing disruptions of Bloomland's services to its clients, then Bloomland would be "In Breach" of its contractual obligations to its clients to provide service continuity and security!

Please remember that SPAM are not the only threats being delivered and spread by emails. Trojans, Viruses and Phishing scams are amongst the more potent forms of payload for emails!