The Importance of the Subject Line

Your subject line is the first, and sometimes only, thing a recipient sees before deciding whether to open your email. It's worth getting right. Here are some updated tips to help make sure your emails get opened, read, and clicked.

Keep it short, sweet, and simple

Subject lines get cut off when they're too long, especially on mobile. With well over half of all emails now opened on a phone or tablet, aim for 30 to 50 characters, and put your most important words in the first 30. That's the part guaranteed to show up no matter what device someone is using.

Including more information is what the Preheader is for.

Need help trimming? Cut words that don't add value. Generic filler words tend to underperform more specific, relevant ones. A subject line tester can help you compare options before you send.

Include localization

Every contact wants to know your email is relevant to them. Subject lines that reference a specific local area or neighborhood tend to see stronger open rates than generic ones.

Tell your contact what's in the email

Avoid the temptation to be vague or withhold the subject just to earn a click. That approach leads to disappointment when the email doesn't deliver what the subject line implied, and it trains people to stop trusting your emails.

Start with action-oriented verbs

Subject lines that open with a strong verb tend to feel more direct and inviting than ones that just announce a topic. For an open house, "Join us for an up-close look at this stunning mid-century" gives people a reason to click. "Open house announcement for 123 Anywhere Street" doesn't.

Make people feel special

A sense of exclusivity can be a strong motivator, particularly in luxury or high-value segments. Phrasing like "For a few key clients" or "A pre-market opportunity for an exclusive group" can make recipients feel like insiders.

Use real urgency, and be careful with it

Genuine urgency and scarcity can lift open rates. But this is an area to be genuinely careful with, not just a nice-to-have caution. Washington State's Commercial Electronic Mail Act (CEMA) prohibits false or misleading statements in commercial email subject lines, and a wave of class action lawsuits since 2025 has specifically targeted retailers over subject lines implying a sale was about to end when it wasn't, or that inventory was limited when it wasn't. Courts have so far rejected the usual defense that federal law overrides these state claims, and several other states have similar laws on the books.

The rule is simple: only use urgency language when it's true. If a deadline gets extended, don't reuse the same "ends tonight" framing next week. If you say something is limited, it needs to actually be limited.

Use numbers thoughtfully

Numbers combined with local relevance can still perform well for real estate content, for example "Scottsdale single family homes gain 2% in latest market report" or "Join 300 of your neighbors at our monthly get-together." That said, newer data on cold outreach shows numbers don't reliably lift performance the way older studies suggested, so treat this as something worth testing with your own list rather than a guaranteed win.

Don't rely on banned words to avoid spam

You may have heard that words like "Free," "% Off," "Deal," or superlatives like "perfect" and "amazing" will send you straight to spam. That's mostly outdated advice. Modern spam filters, especially since Gmail and Yahoo's 2024 authentication requirements, weigh sender reputation and recipient engagement far more heavily than specific keywords. These words alone won't sink your deliverability. That said, they can still come across as pushy or low-value to a human reader, so use them sparingly, and skip the exclamation points, which read as unpolished more than anything else.

The bottom line

Be clear, be relevant, be honest, and personalize where you can. Test subject lines against your own audience rather than assuming any single tactic will work the same way for every list.