How to send SMTP commands and IP not be blocked?

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I am developing a PHP system that sends SMTP commands for email validation, but the problem is that in some providers my IP is added in Blacklist. Is there any way to fix it?

To validate I am sending some commands by socket:

HELO dominio.com.br
FROM: <[email protected]>
RCPT TO:<[email protected]>

Using the above commands I can pick up several messages from the system.

php ip smtp
  • 1

    What are these commands? It’s hard to answer so because you can’t know exactly what you’re doing wrong.

  • I edited the question

  • It seems to depend on the amount of queries you make per server.

1 answer

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Your ip is entering Blacklist because the target provider is detecting an unusual mass activity along with your local ip, try to set a much lower limit for queries and checks, something around 20 to 50 per hour should solve your problem if it is a validation with MX syntax only.

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