Email marketing for lawyers: Best practices for law firms

Email marketing for lawyers works best when your firm sends useful, practice-specific content to a clean and segmented list on a predictable schedule. Firms should track open rate, clicks, and replies, and treat the channel as a way to stay close to clients, referrers, and prospects.

Email remains one of the strongest channels for a law firm. According to MailerLite, legal has the highest click rate of any industry at 4.90%, against an average click rate of 2.09% across all industries. Legal readers click on helpful content, so sending a good email comes down to relevance and timing. This guide covers what to send, how often to send it, the US rules your firm needs to follow, and metrics.

What emails should a law firm send?

Most law firm email programs involve client alerts, practice group newsletters, event emails, welcome emails, and firm news.

Client alerts explain a change in law, regulation, or case outcome and what it means for the reader. In Greentarget and Zeughauser Group’s 2025 State of Digital & Content Marketing report, 76% of in-house counsel said usefulness is what draws them to content, and nearly half want more practice-specific updates from their outside firms. The best alerts open with a short summary of changes and close with the practical impact and lawyer to call.

Practice group newsletters gather insights, recent alerts, and upcoming events for one audience on a regular schedule. A newsletter for employment clients should include different content from one for fund managers, so build each around a single practice area or sector. Relevance is the most common reason in-house counsel and C-suite leaders rate law firm content as less than excellent.

Event emails cover invitations, reminders, and follow-ups for webinars, seminars, and client events. The follow-up email is most important, since it delivers the recording and slides and gives your lawyers a reason to continue the conversation.

Welcome emails go to new subscribers and set expectations. They should tell people what they signed up for, how often they will hear from you, and how to change their preferences.

Firm news such as lateral hires, rankings, and new offices works best as a short section inside your newsletters.

How do you build and segment a law firm email list?

Your list should start with your lawyers’ relationships. Ideally, clients, referrers, former colleagues, and event attendees are all tracked in your CRM, and website sign-up forms will add people who found your firm through content. Build from these sources and avoid purchased lists, which result in high bounce rates and spam complaints.

Once you've built a master list, you then need to segment it. The most useful segments for law firms are practice area interest, industry sector, relationship type (client, prospect, referrer, or alumni), and role.

List health takes ongoing work because contacts change roles and firms. Remove hard bounces after every send, update records when someone moves, and review inactive contacts each quarter. As part of this work, you need to make sure you’re capturing and managing consent and preferences.

How often should a law firm send marketing emails?

The right frequency for your firm’s marketing emails depends on the format. Client alerts often go out when news breaks, ideally within a day or two while the change is still fresh, while practice group newsletters are typically sent monthly or quarterly. Regardless of the regularity, a steady cadence will help readers learn when to expect you.

The main risk with cadence for most firms is volume across practice groups. A general counsel who subscribes to three newsletters and attends one event could receive five emails from your firm in a week if you don't have a shared system to keep track of all sends. That’s why you need to agree on a firmwide cap per contact, keep a shared send calendar, and give recipients a preference center so they can choose their topics and how often they hear from you. If engagement drops or unsubscribes rise after a change in cadence, scale back and test again.

What are the email marketing rules for US law firms?

Law firm email in the US sits under two sets of rules: federal commercial email law and your state’s rules of professional conduct.

CAN-SPAM

The CAN-SPAM Act applies to commercial email sent to recipients in the United States and works on an opt-out basis. It requires accurate header information and honest subject lines, clear identification of the message as an advertisement, a valid physical postal address, and a plain explanation of how to opt out. Opt-out requests must be honored within 10 business days. Each email in violation can carry a penalty of up to $53,088.

State bar advertising rules

Each state has its own version of the ABA Model Rules on advertising and solicitation. Model Rule 7.1 prohibits false or misleading communications about a lawyer’s services, which covers subject lines, case results, and any comparison with other firms.

The solicitation ban under the ABA Model Rules covers live person-to-person contact, such as in-person conversations and phone calls, so marketing email generally falls under your state’s advertising rules. Those rules can vary more than firms expect though. The simplest safeguard is to consult your firm’s ethics or general counsel to make sure your emails will meet your state’s rules. Client confidentiality applies too, so get client consent before naming a client, matter, or result in a marketing email.

Note: these rules change over time, and this guide is general information.

How do you make sure law firm emails reach inboxes?

Deliverability determines whether your content is seen by recipients. Most law firm email goes to clients and contacts at their work addresses, where inboxes are filtered by corporate security tools like Microsoft Defender, Mimecast, and Proofpoint. These filters can be especially strict at banks, healthcare companies, and other regulated businesses. To ensure your emails have high deliverability rates, you will want to authentic your domain, monitor your content and sending habits, and maintain your list hygiene.

Set up SPF, DKIM, and DMARC authentication on the domain you intend to send from. This allows receiving servers to confirm your emails come from your firm. Many firms choose to send marketing emails from a subdomain, such as news.yourfirm.com, to protect the reputation of the main domain your lawyers use for day-to-day client work. Your IT team or email platform can confirm if your setup is correct.

Content and sending habits matter as much as the technical setup. Corporate filters look closely at links and attachments, so link to trusted domains and share documents through links your website instead of attaching them. Make sure each email reads well if images are blocked, since many corporate inboxes block them by default. A consistent sender name and a steady sending rhythm also help, because sudden spikes in volume can look suspicious to filters.

List hygiene protects your reputation over time. Remove hard bounces after every send, since repeated bounces to old addresses signal a poorly maintained list. When a key client tells you your alerts aren’t arriving, ask their IT team to allowlist your sending domain.

What should law firms measure in email marketing?

The main email metrics for law firms are open rate, click rate, click-to-open rate, unsubscribe rate, and bounce rate, tracked by segment. Beyond the inbox, you should also track meetings, event registrations, and new matters that follow each send.

Law firm email marketing checklist

How Nexl supports email marketing for law firms

Run smarter email campaigns, events and follow-ups with Nexl Marketing. Nexl Marketing brings email campaigns and event management into the same platform as your CRM. Consent status, preferences, and engagement history sit with each contact record, so your team can build segments from relationship data and send emails knowing permissions have been captured. Book a demo to see how Nexl could support email marketing at your firm.

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