Checking the validity of an email address - (Moved)

[XanzyX]

I have a client that sends millions of emails monthly.  His has a valid opt-in and opt-out in place. I even wrote him a script that checks the validity of the email address with respect to the format. I even download a list of the Top Level Domains (TLD's ie.  .com, .net, .org. etc.) as a part of my check (http://data.iana.org/TLD/tlds-alpha-by-domain.txt) He routinely removes people that unsubscribes and removes bounced email addresses.

 

The other day he asked me if there was a way to validate the email address by checking the email address against the domain’s MX and DNS records to see if that user exists before the email is added to his list.

[Jos]

Moved to the appropriate forum, as the AutoIt Example Scripts forum very clearly states:

Quote

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[Jos]

Is there also a question as your post only makes statement?

Jos

[XanzyX]

Is there a way to validate the email address by checking the email address against the domain’s MX and DNS records to see if that user exists?

[Simpel]

Hi.

You can check DNS record this way:

Local $sDomain = "autoitscript.com"
_CheckDomain($sDomain)
If @error Then
    MsgBox(0, 'Error', "Domain not found.")
Else
    MsgBox(0, 'Success', $sDomain & " exists.")
EndIf

Func _CheckDomain($sDomain)
    TCPStartup()
    TCPNameToIP($sDomain)
    If @error Then
        TCPShutdown()
        Return SetError(1)
    EndIf
    TCPShutdown()
    Return 1
EndFunc

Regards, Simpel

[jchd]

Most SMTP servers do check the RCPT TO: adress before accepting the DATA: part of the protocol.
Here's an example:

here login protocol, then
"MAIL FROM:<user123@mydomain.mytld>\r\n"
"250 ok\r\n"
"RCPT TO:<destinee@hisdomain.histld>\r\n"
"250 ok\r\n"
"DATA\r\n"
"354 go ahead\r\n"

Check that you get the 250 status and cancel the session.

The issue is that not all servers follow the RFC, e.g. gmail.

[XanzyX]

Thanx

thats a good place to start

Edited August 5, 2018 by XanzyX