How to send SMTP commands and IP not be blocked?

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I'm 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. Do you have any way to resolve this?

To validate I'm sending some commands per socket: 

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

Using the above commands I get several system messages.

    
asked by anonymous 12.11.2014 / 10:24

1 answer

1

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

    
22.06.2017 / 10:29
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