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What Affects Email Delivery? Part 1

As a delivery manager, I’m often asked about how to avoid email delivery mistakes. So, I’ve gathered some information to help you to improve your email campaign delivery results. I hope this is helpful, please let me know if you have questions!

Spam Filters

You may know, spam filters are installed on email servers of companies, email service providers (ESPs) and Internet service providers (ISPs) like Gmail, Hotmail, Yahoo, AOL, FastMail, and in order to be protected against unsolicited bulk messages. With these filters in place, there are several factors indicating whether your message will land in the inbox or spam folder:

  • large images in email
  • large attachments
  • incorrect links
  • long subject line
  • spam words in subject line
  • spam words in email content
  • forms and scripts in email content
  • bad reputation of email sender
  • emails form this sender have not been opened for a long time

Read through this blog post for more information on spam filters.

Anti-spam Policy

Spam regulations are different in each country; however, most email service providers (ESPs) follow CanSpam rules and internal terms of use of each service. By signing up for Mailigen, every user agrees to be bound by the Mailigen Terms and Conditions and the Anti-Spam Policy.

When sending out bulk email, recipients must know they have opted into your list to receive those newsletters. Every email must contain the sender name, company name, address and unsubscribe link.

Remember, email marketing is based on permission. If you want your emails to be delivered, you have to receive permission from each contact on your list. Otherwise your company brand may suffer because of a dissatisfied recipient.

Spam Traps

Spam traps are email addresses that are made for the sole purpose of identifying spammers. There are two types of spam traps.
1. Spam trap emails made by anti-spam organizations

In order to catch spammers, anti-spam organizations set up emails that can be found on the Internet—for example, in different websites, forums, blogs. Spam trap emails are inserted in the HTML code so they are not visible for usual Internet surfers. Setting up spam traps is necessary to find those users who gather email addresses using scrapers or bots. If an anti-spam organization finds out that a message is sent to the spam trap email address, it will automatically block the sender IP address, sender domain, sender email, and sender email domain.

If the Mailigen team detects that a user has sent an email campaign to a spam trap, this user account will be blocked, and in some cases, if Mailigen has financial losses, compensation will be demanded from the appropriate company.

2. Spam trap emails made by ISPs

Some ISPs, like Hotmail, turn old email addresses not used for a long time into spam traps. For example, if you send a newsletter to the email address that has not been used for 6 months, in the campaign report, you will see this email address is non-existent and it is hard bounce. But if you send a newsletter after a year, in the report you will see that email address is existing because the ISP system had automatically transformed this email into spam trap email.

If the email campaign is sent to a lot of spam trap emails, ISPs can block the sender IP address, sender domains, sender email, sender email domain, as well as damage sender reputation.

According to our Mailigen Anti-Spam Policy, you cannot use email lists older than 6 months without sending a permission reminder, because during this period of time people can forget they have signed up to your list, and old email addresses may turn into inactive email addresses. So, if your list contains email addresses older than 6 months, it can have a negative impact on your email delivery.

Follow our blog and read What Affects Email Delivery? Part 2.

If you want to find out more about email delivery or want to improve your delivery results, contact Mailigen team and we will help you!

What Affects Email Delivery? Part 1
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