Many marketers mistakenly summarize their entire email in the subject line, removing any incentive to open it. To increase curiosity, provide only a hint or a compelling data point from the email's content. This creates an information gap that subscribers feel compelled to close by clicking.

While many marketers use brackets at the beginning of email subject lines, new data from subjectline.com shows placing them at the end is boosting open rates. This tactic works by drawing the reader's eye to a key callout, and contrary to myth, it does not negatively impact deliverability or land emails in spam.

Contrary to old advice, adding a newsletter edition number to the subject line is now highly effective. Specifically, putting the edition in brackets (e.g., "[Scoop #12]") before the main subject line has been shown in A/B tests to increase open rates by approximately 20% compared to a standard subject line.

During the first week of April, capitalizing on the corporate shift from Q1 to Q2 by including "Q2" in email subject lines can increase open rates by over 20%. This timely reference taps into the audience's focus on quarterly planning, launches, and trend analysis, making the email feel immediately relevant.

Contrary to old email marketing wisdom, testing fully capitalized subject lines can significantly increase open rates by 3-4 percentage points. Modern spam filters are less likely to penalize this tactic, making it a viable test for grabbing attention in a crowded inbox.

A counterintuitive yet effective email tactic is capitalizing an entire word in the middle of a subject line, not at the start or end. This simple, cost-free A/B test is trending because it breaks visual patterns in the inbox, leading to a reported 16% open rate increase for B2B and 21% for B2C.

Many marketers mistakenly reveal the entire value of an email in the subject line, killing any reason to open it. To maximize opens, provide a compelling hint or create a curiosity gap rather than giving away the full story.

Contrary to previous best practices, adding a newsletter edition number in brackets within the subject line is now highly effective. Recent A/B testing reveals this tactic can increase open rates by approximately 20% compared to using a standard subject line alone.

Contrary to old marketing beliefs, using all capital letters in a subject line can significantly increase open rates without negatively impacting deliverability. It's a simple test many marketers avoid due to outdated fears of spam filters.