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ISPs are trying to protect their users from being spammed by refusing to accept email that are relayed from an IP address... 


Some mail servers didn't accept emails from my mail server, saying that it is an open relay. What does that mean?

Open relay means that anyone can use your mail server to relay emails anywhere--in short; spammers can send junk mail via your mail server to hundred of thousands of recipients by simply sending only one email message using the BCC: field.


Since many ISPs are trying to protect their users from being spammed; they usually refused to accept emails that are relayed from an IP Address--by performing a reverse DNS look-up... To ensure that SMTP mail server, requesting to send emails actually exists and if it does not--mails may still

be accepted and gets deleted without notifying the sender or after the initial HELO handshaking command... terminate the receiving process (See: How email works) and your mails becomes undeliverable in your mail server outbox. See: Email Filtering  
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SMTP - Simple Mail Transport Protocol a protocol governing email transmission and reception (sending and receiving emails between mail servers).

If you are Blacklisted by, MAPS and several others, you can get out of their lists after you have stopped being an Open relay mail server, by going to their site submit your mail server for testing.

Their automated system will perform the test and remove your IP address from their database.

If you are using your own mail server program... See: Mail Server FAQs

It is not (your) the mail server that gets blacklisted, it is your email domain IP address or the
Block of IP address address that are maintained by your ISPs or administrators.

How to check if your email domain desktop computer mail server or your ISPs mail server are in the blacklist or not. Visit anyone of the following sites, follow the site instructions and you will get an immediate report...

You can monitor some of the most widely-used blacklist at.. or make a Google search for: Internet Abuse Spam Blacklists

or at MAPS Realtime Blackhole list

SMTP - Simple Mail Transport Protocol are used for sending and receiving email messages. It is a protocol governing email transmission and reception.

Email servers uses a variety of protocols to communicate with the Internet and SMTP, POP3 (Post Office Protocol) are for sending and retrieving mails from a mail server.



Mike Enlow
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