Home
>
Spam Blocking
>
Blackhole or Fail - Which One Is Better For Your Mail Server?

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

Very often SPAMMERS take advantage 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 highly 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 control panels (like cPanel) the user or admin can decide 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:

:fail: is the preferred option over :blackhole:.

The :blackhole: option accepts everything sent to the domain mail server and then throws away the email going to a non-existing email account. This option uses the full amount 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 imagine the impact onto your server resources. Imagine 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. Performance 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 during the smtp handshake conversation - therefore the actual email message will never make it to your server. It is being refected from entering your system and the sender's email server has to deal with the stuck message. This option is also the better one for legitimate emails where the sender has actually 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 handle many more :fails: than it can do :blackholes:.

This article can be published by anyone as long as a live back link to http://www.webhostingresourcekit.com is provided. (this note can be removed as long as a link from the author's resource box is provided)

Christoph Puetz is a successful small business owner (Net Services USA LLC) and international author.

Guides, Tutorials, and Articles for small businesses - http://www.webhostingresourcekit.com

professional home cleaners Winnetka ...

In The News:

Uber teen accounts now feature live video streaming from the driver's camera, but encrypted recordings stay on Uber's servers for up to 14 days.

Router firewalls and software firewalls serve different roles in protecting your home Wi-Fi from unwanted traffic and suspicious connections.

A Chrome extension with 70,000 users and a 4.7-star rating began injecting fake update warnings after a threat actor acquired and weaponized it.

Amazon's Alexa+ rolls out free to Fire TV devices across the U.S., but hands-free microphones and stored voice data raise key privacy questions.

Meta's new teen accounts settlement sets a default two-hour daily limit on Instagram and Facebook, plus night mode and school mode restrictions.

The CareCloud data breach exposed Social Security numbers, banking information and medical records belonging to more than 3.75 million people.

Waymo reveals its custom 5-nanometer chip and dual computing systems designed to take over instantly if the robotaxi's primary computer fails.

Identity theft now includes account takeover, phone hijacking and payment card exposure. Here's what to look for in identity theft protection services.

Stay up to date on the latest AI technology advancements and learn about the challenges and opportunities AI presents now and for the future.

The FBI and Justice Department seized domains tied to QScan and QTRouter, tools allegedly used by China-linked hackers to breach NASA and other agencies.

Uber Eats drone delivery launches later this year through a Zipline partnership, starting in Dallas and Houston with a goal of one million daily flights.

Medicare Open Enrollment scams start with data broker targeting months before October. Learn why August is the time to remove your personal info.

The World Humanoid Robot Games' crashes show how far the technology still needs to go to be useful, "Survivor" reality TV star and robotics scientist Christian Hubicki says.

X-Humanoid's TianGong Ultra ran 100 meters in 9.32 seconds at Beijing's World Humanoid Robot Games, beating last year's winner by more than half.

A tap-to-pay charity scam is turning small $15 or $20 donations into charges of nearly $5,000, with victims losing thousands before they notice.

Kurt Knutsson shares seven emergency preparedness lessons from surviving Hurricane Katrina inside a New Orleans hotel as conditions turned desperate.

A contractor stored credentials in a Google Doc set to "Anyone with the link," and Google Search autocomplete eventually surfaced the password string.

New Orleans 911 uses Carbyne AI to triage repeat auto crash calls, but strict limits keep human call-takers in control of all other emergencies.

A single card skimmer can generate $1 million in stolen funds, and Secret Service video shows criminals installing them in under two seconds.

ChatGPT, Meta AI and Google now use memory, connected apps and past chats to personalize ads and responses in ways most users overlook today.

MagicalAuth by Glide.id uses cryptographic SIM credentials to verify bank logins without sending SMS OTP codes that scammers can intercept or phish.

A humanoid robot named Lightning Bolt ran 100 meters in 9.39 seconds at the World Humanoid Robot Games in Beijing, edging Usain Bolt's record.

An AI agent using Claude AI canceled another person's gym booking after finding a security flaw in the reservation system's authorization checks.

Trump signed a memorandum allowing vetted private U.S. companies to conduct cyber operations against foreign criminal organizations under oversight.

Your Social Security number appeared in a breach, but exposure and identity theft are not the same. Here's how identity restoration actually works.

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

Spam Blocking