The subject line and preheader are the two text fields shown in the inbox list before a message is opened. They determine whether a recipient opens, ignores, or reports the message.
Do emojis in subject lines hurt deliverability?
Not directly. They can hurt engagement with B2B audiences and render inconsistently across clients.
Why does email subject lines matter for deliverability?
Subject lines are the highest-leverage copy you write. They also affect complaint rates, which feed reputation.
What is the first step to get started with email subject lines?
Keep subject lines under 50 characters so they survive mobile truncation.
What is the most common email subject lines mistake?
Clickbait that produces opens but drives complaints and unsubscribes.