Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3/4TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

VB.NET UWP/WinRT Examples

ASN.1
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Azure Cloud Storage
Azure Service Bus
Base64
Bounced Email
Box
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
ECC
Email Object
Encryption
FTP
Facebook
FileAccess
Firebase
GMail REST API
GeoOp
Google APIs
Google Calendar
Google Cloud Storage
Google Drive
Google Sheets
Gzip
HTML-to-XML/Text
HTTP
HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)

Java KeyStore (JKS)
Jira
MHT / HTML Email
MIME
Microsoft Graph
NTLM
OAuth1
OAuth2
OneDrive
OpenSSL
Outlook
PEM
PFX/P12
POP3
PRNG
PayPal
Peoplevox
QuickBooks
REST
REST Misc
RSA Encryption
SCP
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
SharePoint
Shopify
Socket/SSL/TLS
Spider
Stream
Stripe
SugarCRM
Tar Archive
Twitter
Upload
VoiceBase
Walmart
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Xero
Zip
curl
eBay

 

 

 

(VB.NET UWP/WinRT) MailMan GetBadEmailAddrs

Demonstrates how to get the email addresses flagged as invalid during an SMTP send.

Note: An SMTP server can only issue errors for email addresses under it's own domain. For example, if using smtp.gmail.com to send email, the GMail server can only know what emails in the gmail.com domain are invalid. If, for example, the "TO" recipient is "doesNotExist@chilkatsoft.com", then the email would be accepted. If it's not actually a valid email address, it is not flagged as an error during the client-to-SMTP-server conversation. (If the email address turns out to be truly invalid, then a DSN (Delivery Status Notification, or "bounce") email *might* be sent by the final destination mail server to the return address.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

'  Demonstrates how to get the list of invalid email addresses flagged by the SMTP server
'  at the time of sending (i.e. during the SMTP conversation).

Dim mailman As New Chilkat.MailMan

'  Any string argument automatically begins the 30-day trial.
Dim success As Boolean

success = mailman.UnlockComponent("30-day trial")
If (success <> True) Then
    Debug.WriteLine(mailman.LastErrorText)
    Exit Sub
End If


mailman.SmtpHost = "outlook.office365.com"
mailman.SmtpPort = 587
mailman.StartTLS = True

'  Set the SMTP login/password
mailman.SmtpUsername = "OFFICE365-SMTP-LOGIN"
mailman.SmtpPassword = "OFFICE365-SMTP-PASSWORD"

'  Create a new email object
Dim email As New Chilkat.Email

email.Subject = "Testing for Chilkat API..."
email.Body = "Testing for Chilkat API..."
email.From = "Chilkat Support <my-office365-user@mydomain.com>"
success = email.AddTo("Chilkat Admin","admin@chilkatsoft.com")
success = email.AddTo("Non-Existent Recipient 1","nonexist1@something.com")
success = email.AddTo("Non-Existent Recipient 2","nonexist2@gmail.com")
'  To add more recipients, call AddTo, AddCC, or AddBcc once per recipient.

'  Allow SendEmail to succeed even if some recipients are rejected immediately
'  by the SMTP server.
mailman.AllOrNone = False

'  Call SendEmail to connect to the SMTP server and send.
'  The connection (i.e. session) to the SMTP server remains
'  open so that subsequent SendEmail calls may use the
'  same connection.
success = Await mailman.SendEmailAsync(email)
If (success <> True) Then
    Debug.WriteLine(mailman.LastErrorText)
    Exit Sub
End If


success = Await mailman.CloseSmtpConnectionAsync()
If (success <> True) Then
    Debug.WriteLine("Connection to SMTP server not closed cleanly.")
End If

Debug.WriteLine("Mail Sent!")

'  IMPORTANT:  This example uses the Office365 SMTP server.  However, Office365 does not
'  reject any invalid emails, even for it's own domain.  This is common behavior.
'  The same is true for GMail.  In many cases, the recipient email addresses are silently
'  accepted by the SMTP server, even if known to be invalid.

'  Using GetBadEmailAddrs would only make sense for server that explicilty rejects local recipients
'  known to be invalid.

'  Examine which email addresses were rejected by the SMTP server during the SMTP conversation.
'  (i.e. during the SendEmail)
Dim badAddrs As Chilkat.StringArray = mailman.GetBadEmailAddrs()
Dim numBadAddrs As Integer = badAddrs.Count
Dim i As Integer = 0
While i < numBadAddrs
    Debug.WriteLine("Rejected recipient " & i & ": " & badAddrs.GetString(i))
    i = i + 1
End While


 

© 2000-2019 Chilkat Software, Inc. All Rights Reserved.