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SMTP Proxies (Port 25)

SMTP proxies are servers with an open port 25, through which you can send email. Sending only works via HTTPS or SOCKS proxies; plain HTTP proxies are not suitable for this task. These proxies are useful for bulk mailing, deliverability testing, and mail system diagnostics. Each proxy in the list undergoes automatic SMTP port verification. Actual performance may vary depending on load and rotation. Learn more about SMTP proxies in our knowledge base. You can also purchase premium access and get the full list of SMTP proxies.

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When is the SMTP25 list useful?

When is the SMTP25 list useful?

This section is for working with mail protocols and testing network connections. Main tasks:
  • Selecting addresses with open port 25.
  • Checking chains for mail sending.
  • Deliverability tests and bypassing provider-side port blocks.
  • Monitoring fresh nodes before launching tasks.

What to look at in the table?

Key SMTP indicators are the last check time and response stability. Important note: if your task is working through mail web interfaces or APIs, HTTPS or SOCKS5 proxies are more effective. They fit browser sessions and standard automation better.

Useful for working with SMTP

Tools and sections to help set up and test SMTP connections through a proxy.

Check

Check your IP and ports

See which address the mail server sees on connection. Useful before sending to confirm traffic goes through the proxy.

Open IP check
Open IP check
Reference

Protocols and ports in the knowledge base

Learn why SOCKS5 is better than HTTP for mail tasks, which ports are needed, and what limitations to consider.

Read in knowledge base
Read in knowledge base