Using quotation marks, dollar signs and exclamation points in subject lines will frequently trigger mail filters, as well as using all capital letters (shouting). Never put a toll-free number in the subject line and never use a font size larger than 18 point, or you could trigger some Spam filters.
Update Your Lists Frequently
Another feature of email marketing and list management is vital: checking and updating your list frequently. This is best done automatically. For instance, if a subscriber chooses to “unsubscribe”, your email list manager should immediately take them off your mail list, to prevent accusations of “Spam”. Failing to update your list can cause you to be blacklisted with their ISP. It’s essential to include an “unsubscribe” link in each email that you send out, and to honor this request as soon as it occurs.
Also, non-deliverable mails need to be looked at. Is it due to hard-bouncing (wrong email address/domain name?) or is it a soft-bounce (misspelled name?) In some cases, the address is no longer valid, and should be taken off the list. Most automated list managers will delete emails after a certain number of attempts that get bounced back.
Getting off Blacklists
Even the most legitimate mailings may cause some customers to cry “Spam”. They may forget signing up for your newsletter (even though it was a double opt-in subscription), or have selective memory about signing up to receive email promotions in return for downloading that great free software at your web site.
In these cases, it can help to keep careful records of your opt-ins. If you get blacklisted by an ISP (or even yours, if you are accused of spamming!), show them your records: on January 15, 2009, a customer using the email address blah blah@randomISP.com.au signed up for my newsletter from the IP address (give IP address). This lets the ISP know that you are responsible, and that someone from that ISP DID sign up to receive emails from you. In most cases, the “blacklisting” will be dropped.
By paying careful attention to subject lines, and avoiding those that trigger email filters, your emails have a better chance of reaching your customers, and not being filtered out. By emailing responsibly, and keeping good records, you can avoid accusations of Spam, and enjoy interacting with your customers via email.
Some of the more commonly used phrases that ISPs and mail clients filter out include:
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