5 companies, 5 verified offers, re-checked weekly.
Not sure which you qualify for? Match your repo.
Email, 5 companies
IDCompanyWhat you getStatusVerified
FOS-0025ButtondownemailHalf price on every Buttondown newsletter plan for open source projects that are registered non-profits…ACTIVEverified 2026-09-07›
What you get
Half price on every Buttondown newsletter plan for open source projects that are registered non-profits. Buttondown is a non-tracking email newsletter service with an API.
Applies to
the project , not individual maintainers
Requirements
no stated requirements
How to apply
Sign up, then contact Buttondown support with proof of the project's non-profit status; the offer page publishes no form.
Provenance
Confirmed against buttondown.com/use-cases/open-source on 2026-09-07, matched anchor “If your open source project is a registered non-profit, we offer a 50% discount on all plans”.
FOS-0094HelpmonksemailHelpmonks Hosted Edition (SaaS shared team inbox / email management) free of charge for open source…ACTIVEverified 2026-09-07›
What you get
Helpmonks Hosted Edition (SaaS shared team inbox / email management) free of charge for open source projects; nonprofits instead get a discount of up to 30% on all plans.
Create a free Helpmonks account, then email hi@helpmonks.com with the account details and information about the project and its online presence.
Provenance
Confirmed against helpmonks.com/email-management-for-non-profits on 2026-09-07, matched anchor “Email Management for non-profits and open source projects”.
FOS-0102JetEmailemailFree Pro tier for qualifying open source projects: 50,000 transactional emails per month via SMTP relay…ACTIVEverified 2026-09-07›
What you get
Free Pro tier for qualifying open source projects: 50,000 transactional emails per month via SMTP relay and HTTP API, unlimited verified domains, premium IP pool, inbound routing/webhooks, and delivery analytics; higher volume available on request.
Submit repository URL, license type, sending use case and estimated monthly volume via the contact form on the offer page; review takes about two business days.
Provenance
Confirmed against jetemail.com/open-source on 2026-09-07, matched anchor “free for open source projects”.
FOS-0104KaiMailemailFree program for open source projects and volunteer communities to use their own domain for email:…ACTIVEverified 2026-09-07›
What you get
Free program for open source projects and volunteer communities to use their own domain for email: custom-domain addresses (e.g. contact@, sponsors@, security@) with forwarding, DKIM/ARC signing, no mail server, no per-seat fees.
Applies to
the project , not individual maintainers
Requirements
no stated requirements
How to apply
Contact KaiMail and tell them about your project or community ("tell us about it and we will get you set up").
Provenance
Confirmed against kaimail.net/blog/email-for-open-source/tokyo-python-meetup-april-2026-email-in-python on 2026-09-07, matched anchor “offer a free program for open source”.
FOS-0115Mailman 3emailFree hosting of GNU Mailman 3 mailing lists on the mailman3.com SaaS for open source software projects…ACTIVEverified 2026-09-07›
What you get
Free hosting of GNU Mailman 3 mailing lists on the mailman3.com SaaS for open source software projects ("We love open-source software and provide free hosting for OSS mailing lists").
Applies to
the project , not individual maintainers
Requirements
no stated requirements
How to apply
Email hostmaster@mailman3.com with the project URL and approximate monthly email volume.
Provenance
Confirmed against mailman3.com on 2026-09-07, matched anchor “Open-source support initiative”.