Xbase++

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. Xbase++

LOCAL nSuccess
LOCAL oMailman
LOCAL oEmail
LOCAL oBadAddrs
LOCAL i

nSuccess := 0

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

oMailman := CreateObject("Chilkat.MailMan")

//  SMTP connection settings...
oMailman:SmtpHost := "smtp.example.com"
oMailman:SmtpUsername := "MY_SMTP_USERNAME"
oMailman:SmtpPassword := "MY_SMTP_PASSWORD"
oMailman:SmtpSsl := 1
oMailman:SmtpPort := 465

//  Create a new email object
oEmail := CreateObject("Chilkat.Email")

oEmail:Subject := "This is a test"
oEmail:Body := "This is a test"
oEmail:From := "myemail@example.com"
nSuccess := oEmail:AddTo("person1", "person1@example.com")
nSuccess := oEmail:AddTo("person2", "person2@example.com")
nSuccess := oEmail:AddTo("person3", "person3@example.com")
//  The SMTP server smtp.example.com won't know anything about an email address @somewhere_else.com
nSuccess := oEmail: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.)
oBadAddrs := CreateObject("Chilkat.StringArray")
nSuccess := oMailman:VerifyRecips(oEmail, oBadAddrs)
IF (nSuccess != 1)
    ? oMailman:LastErrorText
    oMailman:destroy()
    oEmail:destroy()
    oBadAddrs:destroy()
    RETURN
ENDIF

i := 0
DO WHILE i < oBadAddrs:Count
    ? oBadAddrs:GetString(i)
    i := i + 1
ENDDO

? "done."

oMailman:destroy()
oEmail:destroy()
oBadAddrs:destroy()