What words and practices should be avoided in email subject lines?

Email marketer from Email on Acid explains that neglecting preheader text is a missed opportunity; use it to supplement the subject line.

Email marketer from Email Marketing Forum explains that making false promises or exaggerating claims in subject lines can lead to distrust and unsubscribes.

Email marketer from Moosend advises that avoiding clickbait tactics and being transparent about the email's content is key for building trust.

Email marketer from Neil Patel's Blog explains that using spam trigger words like 'free,' 'urgent,' and excessive punctuation can negatively impact deliverability.

Email marketer from Mailchimp explains that misleading subject lines that don't accurately reflect the email's content can damage sender reputation and lead to unsubscribes.

Email marketer from Sendinblue explains that keeping subject lines concise (around 50 characters) is important for readability on mobile devices.

Email marketer from HubSpot Blog shares that avoiding personalization or using generic greetings can reduce engagement and make emails appear less relevant.

Email marketer from Litmus shares that using unsupported characters can cause subject lines to render incorrectly, so stick to common characters.

Email marketer from Reddit shares that using all caps or excessive exclamation points in subject lines can make emails look like spam and reduce open rates.

Email marketer from Campaign Monitor suggests that A/B testing different subject lines is helpful for identifying what resonates with your audience and improves open rates.

Expert from Email Geeks shares that you shouldn’t use FREE or !!! in the subject line, based on something read on the internet.

Expert from Spam Resource shares that using all caps in subject lines is generally seen as shouting and can trigger spam filters.

Expert from Email Geeks shares not to use a pink background and that AOL blocks mail with a pink background is old folklore that's wrong.

Expert from Word to the Wise responds by sharing that using URL shorteners in subject lines or the email body can be seen as suspicious and should be avoided.

Expert from Word to the Wise responds by sharing A/B testing to discover what subject lines are best to improve your metrics and results.

Expert from Spam Resource explains that using intentionally misleading subject lines to entice opens is a harmful practice and can damage your sender reputation.

Documentation from Microsoft Documentation explains that adhering to email standards (like avoiding certain characters and encoding issues) is important for deliverability.

Documentation from RFC Editor explains that certain characters and formatting practices should be avoided as they could cause issues with email parsing and display in some systems.

Documentation from Google Postmaster Tools shares that avoiding spam triggers and ensuring proper authentication can help avoid spam filters.