Blackhole or Fail - Which One Is best For Your Mail Server?

Very often Spammers take benefit of catch-all email setup on webservers. Every email no matter what the recipients email address is will be caught by the default email account. It is extremely recommended not to use catch-all email accounts and to discard Spam send to non-existing email addresses. Spam will clog up your Smtp server and consum resources like bandwidth and disk space in mailboxes. In most mail servers and web operate panels (like cPanel) the user or admin can determine what will happen to emails with no existing recipient on the server. Refuse to the let emails onto the server and to let the sender's mail server deal with it (option: ":fail:") or to accept these incoming messages but then to delete them right away (option: ":blackhole:".

Our conclusion:

Mailserver

:fail: is the beloved selection over :blackhole:.

Blackhole or Fail - Which One Is best For Your Mail Server?

The :blackhole: selection accepts everything sent to the domain mail server and then throws away the email going to a non-existing email account. This selection uses the full number of bandwidth, and also requires that the server be reading and writing messages to disk before they are deleted... Multiply this by 1,000 messages a day or so and you can fantasize the impact onto your server resources. fantasize your an email address from your domain (a non-existing one) has been spoofed to send out Spam messages that even carry a virus. Most natural many of these messages will bounce back and hit your mail server. Your web server would have to deal with thousands of attachments at a time. execution will go down - no matter what.

:fail: stops emails send to invalid recipients from entering the mail server in the first place..Exim will reject each message while the smtp handshake conversation - therefore the actual email message will never make it to your server. It is being refected from entering your principles and the sender's email server has to deal with the stuck message. This selection is also the better one for legitimate emails where the sender has absolutely mis-spelled the recipients email address. He would get a bounce message informing him so that the error can be corrected. Depending on your hardware - a server can deal with many more :fails: than it can do :blackholes:.

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