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vit,
Interesting. There was a project nearly identical to this on one of the freelance boards I use to pick up jobs. I didn't bid on it because the poster specifically stated that automated routines would not be allowed - each record had to be checked manually.

I would probably use IO::Socket::Telnet. Something along the lines of this completely untested code:

use IO::Socket::Telnet; my $socket = IO::Socket::Telnet->new( PeerAddr => 'random.server.org', PeerPort => 25, Timeout => 3 ); die "Not an email server\n" if ! $socket; $socket->send("helo mydomain.com"); my $resp; $socket->recv(my $resp, 4096) or die $!; die "Not an email server\n" if ! defined $resp || ($resp !~ /^220 / && + $resp !~ /^250 /);
this link may be of use in determining other SMTP response codes that indicate it is in fact an SMTP server but not necessarily behaving as you might expect.

Cheers - L~R


In reply to Re^3: Determine if domain is actually used for email by Limbic~Region
in thread Determine if domain is actually used for email by vit

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