Guide
Best Email Platforms For Client Accounts for Agencies (2026)
By Red Kite Search Agency Created Updated 9 min read
Summary
Campaign Monitor is the best for reselling email to clients; MailerLite is the best low-cost option for clients who own their accounts; Constant Contact is the best for local clients who want phone support; GetResponse is the best for all-in-one clients. Prices and ratings were checked in October 2026 and change often.
What are the best email platforms for client accounts for agencies in 2026?
Agencies running email for several clients have one question before any other: how does the tool handle separate client accounts, billing and users? Some tools have a real agency model. Others expect one account per client with a separate bill.
We compared four email platforms on that question as well as price and ratings. Read the labels and pick by how you want to run client accounts.
Our shortlist, in order: Campaign Monitor, MailerLite, Constant Contact, GetResponse. The table puts them side by side.
| Tool | Best for | Editorial score | Review-site ratings | Pricing |
|---|---|---|---|---|
| Campaign Monitor | Best for reselling email to clients | 4.4 / 5 | G2 4.1 | At 0 to 500 contacts, annual billing with a 10% discount. Lite $11.70 a month. Essentials $31 monthly, or $22.32 a month with a new-customer promotion until 3 January 2027. Premier $153.90 a month. Enterprise is custom. A free plan and a free trial are offered. |
| MailerLite | Best low-cost option for clients who own their accounts | 4.2 / 5 | No review-site rating found | Prices at 500 subscribers. Free $0 for 250 subscribers. Growing Business $12 monthly or $10.80 billed yearly. Advanced $25 monthly or $22.50 billed yearly. Enterprise is custom. Each account needs its own plan and billing. |
| Constant Contact | Best for local clients who want phone support | 3.9 / 5 | G2 4.1 | At the smallest contact tier. Lite $12 monthly or $10.20 billed yearly. Standard $35 monthly or $29.75 yearly. Premium $80 monthly or $68 yearly. Enterprise and Multi-Account are custom. A free trial needs no credit card. |
| GetResponse | Best for all-in-one clients | 4 / 5 | G2 4.3 | At 1,000 contacts. Free $0 with a 14-day premium trial. Email Marketing $19 monthly or $15.58 billed yearly (3 users). Marketing Automation $59 monthly or $48.38 yearly (5 users). Ecommerce Marketing $69 monthly or $56.58 yearly (5 users). MAX is custom. |
How did we choose the best email platforms for client accounts?
We included tools with public pricing and review-site evidence that agencies commonly use. Pricing and features come from each vendor page, and ratings come from G2 where a score was available.
We looked at sub-accounts, white label, billing options, user limits and contact-based pricing. Scores reflect fit for agencies serving several clients.
What we looked for
- Agency accounts and sub-accounts.
- White label and markup billing.
- Users and seats per plan.
- Pricing by contacts or subscribers.
- Published security and support evidence.
- Public evidence: review-site ratings and counts.
Is Campaign Monitor a good email platform for client accounts for agencies?
Best for reselling email to clients: Campaign Monitor has agency accounts with client sub-accounts, private labeling, markup and billing management, and unlimited users on every plan.
Campaign Monitor is an email platform with a dedicated agency model. Agency accounts hold client sub-accounts that can be white-labelled, with markup options, in-app billing management and send approvals. Plans are Free, Lite, Essentials and Premier, plus a custom Enterprise plan.
Who it suits: Agencies that resell email marketing to clients and want white-label sub-accounts and billing.
Campaign Monitor pros
- Agency features are listed across plans: tiered accounts, client insights, private labeling, markup options and in-app billing management.
- Lite costs $11.70 a month and Essentials $22.32 billed yearly at 0 to 500 contacts.
- Unlimited users and two-factor authentication on every plan.
- Agencies can bill clients directly or let Campaign Monitor invoice on their behalf.
Campaign Monitor cons
- The Essentials price includes a 20% promotion for new customers that ends on 3 January 2027.
- Prices rise with contact count and the page shows the 0 to 500 tier.
- G2 shows 4.1 from 732 reviews, lower than several rivals.
- A mobile app was not stated.
Is MailerLite a good email platform for client accounts for agencies?
Best low-cost option for clients who own their accounts: MailerLite is simple and cheap with a free plan, but each account needs its own plan and billing and there are no multi-account discounts.
MailerLite is an email marketing platform with a drag-and-drop editor, automations, landing pages and websites. It sells a free plan, Growing Business and Advanced plans priced by subscriber count, and a custom Enterprise plan. Each account needs its own plan and billing.
Who it suits: Small agencies and their small-business clients that want an affordable, easy email tool.
MailerLite pros
- Free costs $0 for 250 subscribers, 2,500 emails a month and 2 seats.
- Growing Business costs $12 a month, or $10.80 billed yearly, at 500 subscribers with 3 seats.
- Advanced costs $25 a month, or $22.50 billed yearly, at 500 subscribers with unlimited emails and seats.
- A referral programme and an affiliate programme are offered to agencies and freelancers.
MailerLite cons
- No agency plan, sub-accounts or multi-account discounts: each account needs its own plan and billing.
- Prices rise with subscriber count, so each client list is priced separately.
- Free plan limits are tight: 1 website, 1 landing page and 3 active forms.
- Security certifications and a mobile app were not stated.
Is Constant Contact a good email platform for client accounts for agencies?
Best for local clients who want phone support: Constant Contact has phone support, a large review base and a custom Multi-Account plan for five or more accounts, but small plans limit users.
Constant Contact is an email marketing platform with Lite, Standard and Premium plans scaled by contacts, and an Enterprise Multi-Account option for teams with five or more accounts. It offers a no-card free trial and customer service by phone.
Who it suits: Agencies serving small local businesses that value phone support and a familiar brand.
Constant Contact pros
- Lite costs $12 a month, or $10.20 billed yearly, at the smallest contact tier.
- Premium costs $80 a month, or $68 billed yearly, with unlimited users.
- Enterprise Multi-Account gives centralised control of messaging, templates and approvals for 5+ accounts.
- A free trial with no credit card.
Constant Contact cons
- Lite has 1 user and Standard 3, so team access costs more.
- Send limits are a multiple of contacts: 10x on Lite, 12x on Standard, 24x on Premium.
- G2 shows 4.1, lower than several rivals.
- SOC 2 and SSO were not stated.
Is GetResponse a good email platform for client accounts for agencies?
Best for all-in-one clients: GetResponse bundles email, landing pages and webinars, with rebranding options on custom MAX. There is no agency plan.
GetResponse combines email marketing, automation, landing pages, webinars and ecommerce tools. It sells a Free plan, Email Marketing, Marketing Automation and Ecommerce Marketing plans priced by contacts, and a custom MAX plan with unlimited users and rebranding options.
Who it suits: Agencies that want email, automation, landing pages and webinars in one tool.
GetResponse pros
- Email Marketing costs $19 a month, or $15.58 billed yearly, at 1,000 contacts with 3 users.
- Marketing Automation costs $59 monthly, or $48.38 billed yearly, with 5 users.
- MAX offers unlimited users and rebranding options.
- G2 shows 4.3 from 1,147 reviews.
GetResponse cons
- No agency or client-account plan; rebranding is on custom MAX.
- Free is limited: webinars of 10 people, a GetResponse badge and 1,000 landing page visitors.
- Prices at 1,000 contacts rise with list size.
- Security certifications and a mobile app were not stated.
How much do the best email platforms for client accounts cost?
MailerLite and Campaign Monitor Lite have the lowest entry prices, GetResponse and Constant Contact sit in the middle, and Campaign Monitor Premier is the most expensive. Compare cost per client list and what each plan allows for agencies, not the headline price.
| Tool | Plan | Price | What stands out |
|---|---|---|---|
| Campaign Monitor | Lite | $11.70 per month at 0 to 500 contacts (annual billing) | 0 to 500 contacts, 5x subscriber emails a month, unlimited users |
| Campaign Monitor | Essentials | $22.32 per month at 0 to 500 contacts (annual billing); $31 monthly | Unlimited sends; annual price includes a new-customer promotion |
| Campaign Monitor | Premier | $153.90 per month at 0 to 500 contacts (annual billing) | Unlimited sends, phone support, advanced segments, send time optimisation |
| Campaign Monitor | Enterprise | Custom | Multi-brand and multi-team management, account manager, SOC 2, invoice billing |
| MailerLite | Free | $0 per month at 500 subscribers (monthly billing) | 250 subscribers, 2,500 emails a month, 2 seats |
| MailerLite | Growing Business | $10.80 per month at 500 subscribers (annual billing); $12 monthly | At 500 subscribers, 5,000 emails a month, 3 seats |
| MailerLite | Advanced | $22.50 per month at 500 subscribers (annual billing); $25 monthly | At 500 subscribers, unlimited emails and seats |
| MailerLite | Enterprise | Custom | Custom sending volume, unlimited seats |
| Constant Contact | Lite | $10.20 per month at the smallest contact tier (annual billing); $12 monthly | 1 user, send limit 10x contacts |
| Constant Contact | Standard | $29.75 per month at the smallest contact tier (annual billing); $35 monthly | 3 users, send limit 12x contacts |
| Constant Contact | Premium | $68 per month at the smallest contact tier (annual billing); $80 monthly | Unlimited users, send limit 24x contacts |
| Constant Contact | Enterprise Multi-Account | Custom | For 5+ accounts, centralised control and approvals |
| GetResponse | Free | $0 per month at 1,000 contacts (monthly billing) | 14-day premium trial, then limited free features |
| GetResponse | Email Marketing | $15.58 per month at 1,000 contacts (annual billing); $19 monthly | At 1,000 contacts, 3 users |
| GetResponse | Marketing Automation | $48.38 per month at 1,000 contacts (annual billing); $59 monthly | At 1,000 contacts, 5 users |
| GetResponse | Ecommerce Marketing | $56.58 per month at 1,000 contacts (annual billing); $69 monthly | At 1,000 contacts, 5 users, 100 webinar attendees |
| GetResponse | MAX | Custom | Unlimited users, rebranding options, large lists |
What do reviewers say about these email platforms for client accounts?
G2 evidence differs. Constant Contact has the largest base, GetResponse and Campaign Monitor have solid scores, and MailerLite lists reviews without a score in the snippet we read.
| Tool | Source | Rating | Number of reviews |
|---|---|---|---|
| Campaign Monitor | G2 | 4.1 / 5 | 732 |
| Constant Contact | G2 | 4.1 / 5 | 7,625 |
| GetResponse | G2 | 4.3 / 5 | 1,147 |
Reviewer themes for Campaign Monitor
- G2 shows Campaign Monitor at 4.1 from 732 reviews.
- An agency reviewer says it has served them for over a decade and values its API and transactional emails.
Reviewer themes for MailerLite
- G2 lists 1,115 reviews for MailerLite; the snippet we read showed no overall score.
- Reviewers say it is easy to use, intuitive, and good value for what you get.
Reviewer themes for Constant Contact
- G2 shows Constant Contact at 4.1 from 7,625 reviews.
- Reviewers describe excellent email capabilities and easy connection to other platforms.
Reviewer themes for GetResponse
- G2 shows GetResponse at 4.3 from 1,147 reviews.
- Reviewers praise the easy-to-use designer panel and the automation features.
How do you choose the right email platform for client accounts for your agency?
Decide whether you resell email, manage it, or hand clients their own accounts. Reselling needs sub-accounts and billing. Handing over needs a simple tool the client can run.
Whichever you pick, trial one real client list and check how long setup takes, how billing works and what the client can see.
Set rules before the first campaign: who approves sends, how lists are cleaned and who owns the sending domain. Clear rules protect client reputation.
Finally, ask each vendor how billing works when a client leaves, so the account and the data can move with them.
A quick decision guide
- Reselling email to clients: Campaign Monitor.
- Low-cost, client-owned accounts: MailerLite.
- Local clients wanting phone support: Constant Contact.
- All-in-one clients: GetResponse.
Frequently asked questions
- What are the best email platforms for agencies with client accounts?
- Campaign Monitor for reselling, MailerLite for low cost, Constant Contact for phone support, and GetResponse for all-in-one.
- Which tool has client sub-accounts?
- Campaign Monitor.
- Which tool has multi-account discounts?
- None of the plans we read, and MailerLite says it does not offer them.
- Which tool has a custom multi-account plan?
- Constant Contact, for five or more accounts.
- How were the tools rated?
- Ratings come from G2 where available, and the editorial scores are our own judgement of fit for agencies.
Sources
Prices, plan limits, and ratings were gathered in October 2026 from:
- Campaign Monitor pricing page
- MailerLite pricing page
- Constant Contact pricing page
- GetResponse pricing page
- G2