php - How to check if a received email is legit? -

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i'm developing system gets emails pipe, verify if email address email sent in client database, , write database.

the problem don't want have security issues, , if sends email php system, log too. so, how can check if email sent mail server? thinking in getting ip of mail server of domain , verify in email headers if sent these server. so, if got email test@hotmail.com, ping mail.hotmail.com , check if email came these ip address.

anyway, if got custom domain yourdomain.com, running in shared cpanel server, other people in these server send emails php , ip verify passed. so, thinking in checking if email sent php or mail server, don't know how this.

what suggestion?

i thinking in checking if email sent php or mail server

you not able find out difference between these 2 normally. , email sent php can same email mail server , case email sent php is also email mail server.

you can try write detection on own (your own filter) based on monitoring , finding out wrong mails (or reported users if can not monitor emails because of law regulations).


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