Growth · alternatives · 2026

24 alternatives to ColdSMTP by GMass

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

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. ColdSMTP by GMass launched in 2024; newer entries below may have overtaken it.

1. 1
   Cold Email Warmup by GMass▲98

   A completely free cold email warm-up system

   2021 · its alternatives →

2. 2
   Closers HQ▲83

   Send unlimited cold emails from unlimited mailboxes

   2023 · its alternatives →

3. 3
   Pigeon Mail▲126

   Send hundreds of personalised emails from Gmail

   2021 · its alternatives →

4. 4
   Super Send 2.0▲157

   Automate cold outreach - email, Linkedin & Twitter

   2023 · its alternatives →

5. 5
   Multi Email Forward by cloudHQ 2.0▲77

   Automate forwarding all your Gmail emails to another email

   2019 · its alternatives →

6. 6
   Reply▲331

   Send cold emails that feel warm

   2015 · its alternatives →

7. 7
   Sunnygo▲90

   Generate personalized cold emails using LinkedIn profiles

   2023 · its alternatives →

8. 8
   MassInbox▲168

   Mass cold email subscriptions for agencies and startups

   2023 · its alternatives →

9. 9
   Skylead 4.0▲90

   Close 3x more deals with LinkedIn & infinite email outreach

   2024 · its alternatives →

10. 10
    Bulk Blizzard▲108

    The easiest way to generate cold email templates in bulk

    2023 · its alternatives →

11. 11
    ColdInbox▲108

    Send bulk invitations on Linkedin with personalised messages

    2020 · its alternatives →

12. 12
    CleverlyBox▲3

    Email Automation System Send UNLIMITED Cold Emails,

    2024 · its alternatives →

13. 13
    Cold Email Composer by Bant.io▲81

    Craft the perfect cold email to acquire more customers

    2021 · its alternatives →

14. 14
    Gmail Transactional Email Relay by GMass▲79

    A free service to send transactional emails through Gmail

    2022 · its alternatives →

15. 15
    Cold Mail▲68

    ​Transform cold outreach into warm conversations

    2023 · its alternatives →

16. 16
    Cold Mail Server▲12

    Managed email infrastructure for your cold outreach

    Jul 2026 · coldmailserver.com · its alternatives →

17. 17
    DotMail▲14

    Transform one Gmail into unlimited email addresses

    2025 · dotmail.replit.app · its alternatives →

18. 18
    ClickSell▲8

    Send 100K cold/warm emails per month

    2025 · its alternatives →

19. 19
    Reachkit▲12

    Turn Cold Outreach Into Reliable Revenue

    2025 · reachkit.ai · its alternatives →

20. 20
    QuickMail Lite▲19

    Run powerful cold outreach campaigns for free

    2023 · its alternatives →

21. 21
    Right2inbox▲10

    Build a Healthy Email Reputation, Reach the Inbox Every Time

    2025 · dev-wamachine.pantheonsite.io · its alternatives →

22. 22
    Straight Mail▲5

    Cold Email Outreach

    Sep 2025 · straightmail.co.uk · its alternatives →

23. 23
    GBeast▲6

    Send unlimited emails from unlimited Gmail/G-Suite Accounts

    2022 · its alternatives →

24. 24
    Free & OSS SMTP Bulk Cold Email Sending▲3

    cold0 - bring your own SMTP cold email sending and managing

    Feb 2026 · cold0-gamma.vercel.app · 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 →