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Open Source Email Management Software (2026)
Last updated: April 2026
11 software options
Sponsored
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Customer service software for businesses of all sizes
Free - up to 3 users, forever! Express - $7/user/month billed annually Standard - $14/user/month billed annually Professional - $23/user/month billed annually Enterprise - $40/user/month billed annually A 15-day free trial is available.
Read more about Zoho Desk
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Salesforce B2B marketing automation for marketing & sales
GROWTH Standard marketing automation $1,250/month/up to 10,000 contacts PLUS Advanced marketing automation $2,500/month/up to 10,000 contacts ADVANCED Customizable marketing automation $4,000/month/up to 10,000 records ENTERPRISE $15,000/month/upto 75,000 contacts All plans are billed annually.
Read more about Salesforce Marketing Cloud Account Engagement
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Marketing Email, Transactional Email, Transactional SMS
Mailjet’s free plan gives you access to major features like 1,000 contacts, delivery and analytics dashboards, customer support, APIs and more. Send up to 6000 emails per month. Mailjet’s premium plans offer advanced features like Segmentation, A/B Testing, Email Automation and more. Mailjet works well with structure of all sizes and has a variety of plans for every needs, from Forever Free (6000 emails/month) to Custom Plans.
Read more about Mailjet
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Email management platform with search & filter capabilities
Thunderbird is available for free.
Read more about Thunderbird
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Bloomreach personalizes the e-commerce experience
Contact Bloomreach for pricing information.
Read more about Bloomreach
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Enterprise collaboration and online community software.
Zimbra Collaboration Server (ZCS) is sold per user mailbox in bundled packs of 25, 250 and 2,500. Packs are available as annual, multi-year and perpetual software licenses. Open Source Edition Zimbra Open Source Edition is a free email and collaboration solution ideal for individuals or smaller organizations that do not require Zimbra Support, advanced administration, business continuity and only IMAP email on desktops and devices. Special discounts are available for government, education and non-profit organizations.
Read more about Zimbra Collaboration Suite
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Cloud-based SMTP for email delivery
Kingmailer offers a free 14 day plan for testing purpose, and then scales up to a 1-month or 1-year plan. 1-Month Plan: $11.95 /month 1-Year Plan: $79 /year
Read more about KingMailer
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Email Hosting Solution
Read more about servermx
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
A newsletter and email marketing plug-in.
Free plan allows to send unlimited number of emails, but doesn't give access to advanced statistics.
Read more about AcyMailing
