This whitepaper is in a Query and Reply format and covers ‘how a spam-filter works’.
Q: What actions can get me onto a blacklist or trigger a spam filter to dam our e mail?
Listed below are the primary methods you may get onto a blacklist or have a spam filter block your in any other case good e mail campaigns:
- Ship an e mail marketing campaign that receives too many SPAM complaints. When recipients get your e mail they will click on the ‘That is SPAM’ button on their e mail consumer. This registers with spam filters as a ‘vote’ that your e mail is spam. Too many complaints and your emails will begin going into the SPAM folder or can be outright blocked. Sadly some ISPs like Aol.com encourage their customers to click on the SPAM button as a substitute of unsubscribing, elevating your spam price. Many ISPs have a goal grievance price of lower than 1 grievance per 1,000 emails despatched.
- Ship an e mail marketing campaign to a number of ‘SPAM Honeypots’. (See the subsequent query for a definition of a SPAM honeypot).
- Begin sending a burst of emails from a newly configured e mail server at a brand new IP deal with. With spam filters, you might be responsible till confirmed harmless. An IP deal with that has no e mail sending historical past that impulsively begins spewing out hundreds of emails will appear like a spammer firing up a brand new financial institution of e mail spam cannons rr.com.
- Ship an e mail marketing campaign that has a excessive spam rating (when analyzed by a spam content material filter). In case your e mail seems like spam content material, some spam filters and blacklists will blacklist you for 48-72 hours.
- Register your e mail server with an IP deal with that’s ‘shut’ to different IPs which were flagged as SPAM e mail servers. Sure, it issues what neighborhood you ‘reside’ in. Some blacklists will add your e mail server to their blacklist in case your ‘neighbors’ are recognized spammers. The logic is that both it’s possible you’ll be related to the spammer, or you might be internet hosting your e mail at an ISP who’s keen to host spammers, so you might be responsible by affiliation.
- Ship emails to an inventory with plenty of onerous bounces (invalid addresses). SPAM filters monitor the % of invalid emails you attempt to ship. In case your onerous bounce price is constantly excessive (better than 15% for instance), your e mail fame will fall and it’s possible you’ll be blacklisted for home windows of 48 ~ 72 hours.
- Configure your e mail servers incorrectly. True spammers could be lazy and sometimes don’t configure their e mail severs appropriately. Properly, at the very least that’s the opinion of most spam filters and blacklists, so in case your gear is just not configured appropriately, your emails could also be blocked.
- Ship e mail campaigns to common e mail lists and aliases equivalent to help@, gross sales@, webmaster@, data@ and so forth. These are sometimes aliased to dozens and even lots of of recipients and it’s extremely unlikely that an individual will register on a web site utilizing such an deal with, so you might be more likely to irritate many recipients and generate spam complaints.
Q: What’s a “SPAM Honeypot”?
There are blacklists that work immediately with registrars to ‘re-cycle’ domains once they expire. Ship an e mail to an deal with at considered one of these domains and you’re going to get caught of their ‘honeypot’. Some honeypot-based blacklists are extra devious. They really host web sites with embedded e mail addresses. Utilities that crawl web sites and parse out e mail addresses (which is illegitimate within the US anyway), will seize the honeypot addresses.