Email Deliverability Tips from Tom Kulzer Aweber’s CEO. Ensuring requested opt-in email is delivered to subscriber inboxes is an increasingly difficult battle in the age of spam filtering. Open and click thru response rates can be dramatically affected by as muc as 20-30% due to incorrect spam filter classification.
Permission
Confirming that the people who ask for your information have actually requested to be on your list is the number one step in the battle for deliverability. You should be using a process called confirmed opt-in or verified opt-in to send a unique link to the attempted subscriber when they request information. Before adding the person to your list they must click that unique link verifying that they are indeed the same person that owns the email address and requested to subscribe.
Subscriber Addresses
When requesting website visitors to opt-in ask for their “real” or “primary” email address instead of a free email address like Yahoo or Hotmail. Free emails tend to be throw away accounts and typically have a shorter lifetime than a primary ISP address.
List Maintenance
Always promptly remove undeliverable addresses that bounce when sending email to them. An address that bounces with a permanent error 2-3 times in a 30 day period should be removed from the list. ISP’s track what percentage of your newsletters bounce and will block them if you attempt to continually deliver messages to closed subscriber mailboxes.
Message Format
Usage of HTML messages to allow for text formatting, multiple columns, images, and brand recognition is growing in popularity and is widely supported by most email client software. Most spam is also HTML formatted and thus differentiating between requested email and spam HTML messages can be difficult. A 2004 study by AWeber .com shows that plain text messages are undeliverable 1.15% of the time and HTML only messages were undeliverable 2.3%. If sending HTML it is important to always send a plain text alternative message, also called text/HTML multi-part mime format.
Content
Many ISP’s filter based on the content that appears within the message text.
Website URL:
Research potential newsletter advertisers before allowing them to place ads in your newsletter issues. If they have used their website URL to send spam, just having their URL appear in your newsletter could cause the entire message to be filtered.
Words/phrases:
Choose your language carefully when crafting messages. Avoid hot button topics often found in spam such as medication, mortgages, making money, and pornography. If you do need to use words that might be filtered, don’t attempt to obfuscate words with extra characters or odd spelling, you’ll just make your messages appear more spam like.
Images:
Avoid creating messages that are entirely images. Use images sparingly, if at all. Commonly used open rate tracking technology uses images to calculate opens. You may choose to disable open rate tracking to avoid being filtered based on image content.
Attachments:
With viruses running rampant and spreading thru the usage of malicious email attachments many users are wary of attached documents. It’s often better to link to files via a website URL to reduce recipient fear of attachments and reduce the overall message size.
Email deliverability is about ensuring requested opt-in email is delivered to the intended recipient. While no single tip will enable you to get 100% of your email delivered each one utilized as a group can go a long way to reaching that goal.
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John Rothstein
