B4X

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. B4X

Dim success As Boolean = False

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

Dim mailman As ChilkatMailMan
mailman.Initialize("mailman")

'  SMTP connection settings...
mailman.SmtpHost = "smtp.example.com"
mailman.SmtpUsername = "MY_SMTP_USERNAME"
mailman.SmtpPassword = "MY_SMTP_PASSWORD"
mailman.SmtpSsl = True
mailman.SmtpPort = 465

'  Create a new email object
Dim email As ChilkatEmail
email.Initialize

email.Subject = "This is a test"
email.Body = "This is a test"
email.From = "myemail@example.com"
success = email.AddTo("person1", "person1@example.com")
success = email.AddTo("person2", "person2@example.com")
success = email.AddTo("person3", "person3@example.com")
'  The SMTP server smtp.example.com won't know anything about an email address @somewhere_else.com
success = email.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.)
Dim badAddrs As ChilkatStringArray
badAddrs.Initialize
success = mailman.VerifyRecips(email, badAddrs)
If success <> True Then
    Log(mailman.LastErrorText)
    Return
End If


Dim i As Int = 0
Do While i < badAddrs.Count
    Log(badAddrs.GetString(i))
    i = i + 1
Loop

Log("done.")