Is there a way to check if an email address is good before sending it?

--
Thanks, -Bob
b...@pless.net
Delphi 5

  Please don't crosspost ....

  And no ...   You can validate if it seems legitamte (it's got the @ in it,
etc ....)  --  But that's it ...

--

Jason Wallace
SL Software
Home:  Dark...@SLSoftware.reno.nv.us
Work:  Jason_Wall...@intuit.com

news:8_L35.3041$w7.222994@news-west.usenetserver.com...

You could open a SMTP connection to the mail server and use that protocol to
attempt to send the mail - if the mail is invalid then you will get an error
message about the receipient being invalid - otherwise if valid you could
cancel at that point so that no mail actually goes through and you know that
the address is valid.

news:8_L35.3041$w7.222994@news-west.usenetserver.com...

Use the white pages in outlook an express and apps like bigfoot to check
validity and to find entries.
Bob Pless <b...@pless.net> schreef in berichtnieuws
8_L35.3041$w7.222...@news-west.usenetserver.com...

Some mail servers like QMail will indicate that any address is valid
(they send an error e-mail back to the sender themselves if mail is
send to a non-existent e-mail address), so that method wouldn't work
in a lot of cases..

Most mail servers will reject an invalid mail so without attempting this
method, I fail to see how any an address can possibly be vailidated without
sending an actual mail.

Here is a verify example from RFC 821

                    Example of Verifying a User Name
            S: VRFY Smith
            R: 250 Fred Smith <Sm...@USC-ISIF.ARPA>

Note some mail servers turn off the verify functionality.

Example of SMTP invalid address {*word*59}.  ( from RFC 821 )

         R: 220 MIT-Multics.ARPA Simple Mail Transfer Service Ready
         S: HELO ISI-VAXA.ARPA
         R: 250 MIT-Multics.ARPA

         S: MAIL FROM:<Sm...@ISI-VAXA.ARPA>
         R: 250 OK

         S: RCPT TO:<Gr...@MIT-Multics.ARPA>
         R: 550 No such user here

         S: RSET
         R: 250 OK

         S: QUIT
         R: 221 MIT-Multics.ARPA Service closing transmission channel

news:o9v3lsktjo0bpd2d2gto4idbibmk5efboe@4ax.com...

Do they have automated responses that I could write in my app?
-Bob

news:8isg72$pro$1@news1.xs4all.nl...
: Use the white pages in outlook an express and apps like bigfoot to check
: validity and to find entries.
: Bob Pless <b...@pless.net> schreef in berichtnieuws
: 8_L35.3041$w7.222...@news-west.usenetserver.com...
: > Is there a way to check if an email address is good before sending it?
: >
: > --
: > Thanks, -Bob
: > b...@pless.net
: > Delphi 5
: >
: >
: >
: >
:
: