(Lianja) Verify Email Recipients

A way to possibly determine valid/invalid email addresses. I would recommend being very careful about doing this because your IP address may be flagged as a potential spammer by the mail server (because you are probing for valid/invalid email addresses). This Chilkat functionality existed for many years, before this kind of activity became a problem. The functionality remains only because it is useful for some to test with their own SMTP servers.

Chilkat Lianja Extension Download Chilkat Lianja Extension

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loMailman = createobject("CkMailMan")

// SMTP connection settings...
loMailman.SmtpHost = "smtp.example.com"
loMailman.SmtpUsername = "MY_SMTP_USERNAME"
loMailman.SmtpPassword = "MY_SMTP_PASSWORD"
loMailman.SmtpSsl = .T.
loMailman.SmtpPort = 465

// Create a new email object
loEmail = createobject("CkEmail")

loEmail.Subject = "This is a test"
loEmail.Body = "This is a test"
loEmail.From = "myemail@example.com"
llSuccess = loEmail.AddTo("person1","person1@example.com")
llSuccess = loEmail.AddTo("person2","person2@example.com")
llSuccess = loEmail.AddTo("person3","person3@example.com")
// The SMTP server smtp.example.com won't know anything about an email address @somewhere_else.com
llSuccess = loEmail.AddTo("person3","person4@somewhere_else.com")
// ...

// Verify recipients.
// **** See the warning about using this API method in the description above.
// (An SMTP server only knows valid email address for its own domain.  For example,
// smtp.example.com *may* only know if person1@example.com is valid or invalid, but does
// not know anything about the validity of email addresses having other domains.)
loBadAddrs = createobject("CkStringArray")
llSuccess = loMailman.VerifyRecips(loEmail,loBadAddrs)
if (llSuccess <> .T.) then
    ? loMailman.LastErrorText
    release loMailman
    release loEmail
    release loBadAddrs
    return
endif

i = 0
do while i < loBadAddrs.Count
    ? loBadAddrs.GetString(i)
    i = i + 1
enddo

? "done."


release loMailman
release loEmail
release loBadAddrs