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Optimize Email Content for Improved Deliverability

Learn how to improve your delivery rates by changing the content of your emails

Ira avatar
Written by Ira
Updated yesterday

One of the primary reasons why your emails are not reaching the inbox is that mailbox providers have developed advanced anti-spam technologies to protect their customers' inboxes from spam. Unfortunately, even a legitimate sender could be affected.

In this article, we will discuss the content of your email messages. For more information on other aspects that influence your email placement, please refer to this article.

Brand Image

Let's agree that one of the most critical aspects when choosing whether to open an email is your brand recognition. Various factors may help you with it, including the name of your store/company, your company logo, brand colors, fonts, etc.

The reputation associated with your brand will be important not only for your customers when deciding whether to open your emails or ignore them, but for the email providers as well. Below are some of the aspects you should consider. 

Be Consistent with the Sender's Name

In other words, do not switch between your personal name and your company name. Just choose one and stick with it.


In most situations, it is preferable to use a company or brand name over an individual person's name, unless that person is the brand itself, such as Madonna or Jamie Oliver. If you have a reason to use a person's name and it is not a brand, follow it with a dash, then specify the company or organization you are from.

Pay Special Attention to Your Subject Lines

When creating your subject line, you really have to keep in mind two things:

  • Do not make false promises – clickbaity subject lines that oversell the content in your email may seem like a good idea at first, but they will ultimately harm you. If your users feel that the value of your email content does not match what you promise, they will become frustrated. And what is the result of that? An unsubscribe, or even worse, report as spam. This will harm your sender's reputation.

  • Make the subject line interesting and relevant – As we mentioned earlier, you should avoid overselling your content. But you should still make your subject line attractive and consistent, which will result in more openers and boost your sender reputation.

Use a Matching Preheader

You already know that the sender's name, subject line, and preheader are the first things subscribers see.

Even if most of your subscribers open your messages on the subject line alone, the rest are influenced by other things. While they will likely see the sender's name first, the preheader still plays a role. This is especially useful for email campaigns with shorter subject lines, as the preheader will take up more space in this case.

Email Message Content

Image-to-Text Ratio

While images and other visual content can make emails more engaging, it's also essential to maintain the right balance between images and text. It is one of the first factors most Spam filters check before deciding which inboxes your emails should be delivered to.

Although there isn't definitive evidence that having a good text-to-image ratio always helps, it's still likely that it could favor how well your emails perform. A sentence or two of text should be included to balance each image you have.

Avoiding Spammy Content

Some spam filters don't like the way certain content is phrased. Take a look below at some common mistakes that should be avoided:

  • Excessive use of exclamation points!!!!!!

  • Using phrases like "Click here!" or "Once in a lifetime opportunity!"

  • USING A LOT OF ALL CAPS IN THE SUBJECT LINE AND IN THE BODY TEXT. Don't do that (especially in subject lines).

  • Sending a test to multiple recipients within the same company (your colleagues). The company's email firewall may assume it's a spam attack.

  • Hash-busting: Inserting random characters in the subject line or content to fool spam filters, e.g., "F.ree. p.r! z.e"

  • Be careful with words associated with the language of sales. You can still use them, but don't use them too often. If overused, they may trigger spam filters and route your emails to junk folders. Risky words include: "prize", "free", "bonus", etc.

Simplify the Opt-Out Process

As a marketer, you are required to provide subscribers with the opportunity to opt out at any time. The CAN-SPAM Act actually requires this. But here is the thing. You should not only want to allow subscribers to opt out, but you also need to make it incredibly easy for them to do so. Why? If someone can't quickly find the unsubscribe box, they may end up marking your email as spam in order to avoid receiving future emails from you.

Adding an unsubscribe button in an easily visible location that people can find without any fuss would be the right thing to do. Finally, ensure that you provide them with confirmation that they have successfully unsubscribed.

Optimize Your Emails for Mobile

Statistics show that more than half of email messages are opened on mobile phones. Even if your emails are mobile-friendly, here are the two most significant mobile email fails that lots of clients make:

  • A Typeface that is too small (it should be 12 points or larger)

  • Links that are too close to one another. Links need to be clickable without having to zoom in.

Avoid URL Shorteners

You may often encounter deliverability issues if you use URL or link shorteners in your email content. Link shortening is a popular tool among spammers and phishers because it hides their identity. When a subscriber clicks on a shortened link, they are navigated to a fraudulent web page that may contain malware or to a site used to steal information.

Dealing with Emails Landing in Spam

In case your emails start landing in spam, there are a couple of ways you can resolve this issue:

  • Ensure you are following all the above-mentioned best practices and preventive tactics. Test everything with different email providers and carefully estimate the result.

  • Review all aspects that influence the delivery of your emails and adjust your sending behavior accordingly.

  • If this doesn't help, please contact our support so we can check if there are any issues on our end. We may be able to offer to sign SPF and DKIM records, move you to a dedicated IP, or switch to another one, sign your sender's domain, and more. The particular steps depend on the case and would be recommended by our Deliverability team.


If you have any further questions, please contact us at [email protected].

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