Dev tools · alternatives · 2026

24 alternatives to Free & OSS SMTP Bulk Cold Email Sending

cold0 - bring your own SMTP cold email sending and managing

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   Super Send 2.0▲157

   Automate cold outreach - email, Linkedin & Twitter

   2023 · supersend.io · its alternatives →

2. 2
   .meteoremails▲107

   Send cold emails for free! Free and open source project

   2020 · tempmailo.co · its alternatives →

3. 3
   Reply▲325

   Send cold emails that feel warm

   2015 · reply.io · its alternatives →

4. 4
   Minutemailer▲80

   Create and send beautiful newsletters in minutes

   2023 · minutemailer.com · its alternatives →

5. 5
   Cold Email Generator▲308

   Quickly create a 5-touchpoint email campaign

   2016 · its alternatives →

6. 6
   Bulk Blizzard▲108

   The easiest way to generate cold email templates in bulk

   2023 · its alternatives →

7. 7
   Sunnygo▲90

   Generate personalized cold emails using LinkedIn profiles

   2023 · cold-email-eight.vercel.app · its alternatives →

8. 8
   Bulk Email Sender▲12

   Send bulk emails offline. No cloud. No subscriptions.

   2025 · kannaujian.gumroad.com · its alternatives →

9. 9
   Cold Mail▲68

   ​Transform cold outreach into warm conversations

   2023 · its alternatives →

10. 10
    Straight Mail▲13

    Email Marketing Tool

    2025 · straightmail.co.uk · its alternatives →

11. 11
    Cold Email Warmup by GMass▲98

    A completely free cold email warm-up system

    2021 · gmass.co · its alternatives →

12. 12
    1SecMail▲112

    Free disposable email that actually arrives in real time

    2025 · tmaily.com · its alternatives →

13. 13
    MassFastmail▲76

    Send mass emails in Fastmail

    2020 · chromewebstore.google.com · its alternatives →

14. 14
    AtMailWin▲82

    Winning cold mailing campaigns

    2023 · its alternatives →

15. 15
    InboxFee▲79

    Make strangers pay for their cold emails

    2020 · its alternatives →

16. 16
    Mass Email PRO▲3

    Bulk email sender with your own SMTP — no monthly fees

    Jun 2026 · mass-email-pro.vercel.app · its alternatives →

17. 17
    BaseMailer ▲18

    Design & send personalized bulk emails from Airtable.

    Jan 2026 · basemailer.app · its alternatives →

18. 18PS
    Plain Sending – Send bulk emails using your everyday email client▲8

    2020 · plainsending.com · its alternatives →

19. 19
    VibePR▲3

    Privacy-first cold email with your own SMTP

    Jul 2026 · vibepr.in · its alternatives →

20. 20
    SMTPBOXES▲4

    SMTP Service for Everything ! +Free Platform

    2021 · agententoto.it.com · its alternatives →

21. 21
    Custom cold email▲16

    Custom cold email automated

    2021 · customcoldemail.softr.app · its alternatives →

22. 22OA
    One API for all your SMTPs▲9

    Hi HN, I host my own mail infrastructure and don't rely on third-party tools to send my mails. But in a microservice architecture, managing all the SMTP configs quickly becomes tiresome. After a while I'd always have my credentials and settings scattered in application-properties, bash scripts and environment files. So I've build Brieferl, an app where you can add your SMTP servers and send emails through a single API with a simple JSON payload. You also get logs of when/where emails were sent and HTML previews of messages. I am interested in what you guys think about this. You can…

    2025 · brieferl.com · its alternatives →

23. 23
    ColdSMTP by GMass▲11

    Send unlimited cold emails from 1 account with no warm-up

    2024 · gmass.co · its alternatives →

24. 24
    Reachkit▲12

    Turn Cold Outreach Into Reliable Revenue

    2025 · reachkit.ai · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →