Hello,
My application sends newsletter with automatically generated sender - addresses, because if one of the recipients is not reachable, i want to know which newsletter that was.
When I connect to a Mailserver using system.net.mail, i do not have credentials at this time (they are generated later).
when the e-mail is sent, it works without credentials (the sender attribute of the message is set in a different step of the whole process, so the mail has the right sender address, but is not sent from this account. instead it's sent without authentification)
however, normally when a recipient is not reachable, i get a bouncemail into my mailbox, but in this case not.
when i connect to the mailserver via telnet on port 25 (also without user authentification) and send an e-mail with this senderaddress (the account exists in that case and in case of sending over my application)
the bouncemail is in the senders mailbox.
In fact, bouncemails are always sent to the sender of an e-mail, and the mails which are sent successfully contain the right sender mail address.
in the end i want to excuse my bad english,
i hope someone of you can help me
regards
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