Why does email bounce?

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Hi Leo,
me too have some problem while sendng mail through persistmail.
the bounced mail message is as follows
"-----------------------------------------
MailEnable: Message could not be delivered to some recipients.
The following recipient(s) could not be reached:

Recipient:
Reason: Remote SMTP Server Returned: 553 sorry, invalid envelope sender in header (#5.7.1)

Reason Code: SMTP Outbound - General Error
Error Number: 0

Message headers follow:

Received: from neutron.dns-fusion.com ([65.98.69.125]) by dns-fusion.com with MailEnable ESMTP; Wed, 18 Jan 2006 05:20:54 -0500
-----------------------------------------"

Please guide me how to sort out this problem.

Thanks
PRATIK

i got the error 550 is not a valid mailbox
6 by Persits.MailSender.4

how to fix it in my asp application

Re: the problem with "invalid envelope sender in header" it sometimes helps if you invoke Secure Authentication in your mail clients Server Settings (Thunderbird: Click on mailbox, then Accounts\View Settings For This Account Select the mailbox you're sending from (if more than one) then Server Settings\Use Secure Authentication (I've no idea how to do that in Ou!*?*k. You'll have to improvise). You may need to uncheck this once the errant e-mail has been sent (if this is what the problem is). It works in some cases. Pity the receiving mail server doesn't let you know.

After sending e-mail I got failure notice which stated that mail folder of the recipient is full. If the recipient corrects this problem will my mail delievered or should I resend it?

You'll need to resend.

If someone is in the military and working undercover, could the government have set up their computer so it cannot receive personal mail? I corresponded for years with someone who was a dear friend and now messages come back saying:
This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

...I am afraid for his safety. Could he have died? What happens when someone dies regarding e-mails? Does someone have to go in and delete their address? I know in the past his computer and phone had to go through certain security checks by his employer. I'm confused and worried.

Hi!

when I try to send mail through lotus notes I get the follwoing error
rediffmail.com - Mail server mail2.rediffmail.com rejected your mail;
error: INVALID_MAILBOX_SYNTAX.
Message received from mail server:
553 sorry, invalid envelope sender in header (#5.7.1)

please advise

regards
ramesh

553 sorry, Authentication failed or timed out. Please do get message first to authenticate yourself (#4.4.3).
some time i get this error message after sending a message to perticular sender to whome i am sending mails last six months.

This is the error message displayed while sending a mail From: System Administrator
Sent: Thursday, October 12, 2006 7:09 PM
To: '[Email Address Removed]'
Subject: Undeliverable: cognos 1Q 07

Your message did not reach some or all of the intended recipients.

Subject: cognos 1Q 07

Sent: 10/12/2006 7:09 PM

The following recipient(s) could not be reached:

'[Email Address Removed]' on 10/12/2006 7:09 PM

553 sorry, Authentication failed or timed out. Please do get messages first to authenticate yourself.(#4.4.3)

but the same is sent if I close and reopen ms outlook and try to resend it

"Authentication failed" - you have not configured outlook with the proper account and password information to be able to send mail.

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