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Using invalid email address for sending emails
usually result in bounced mails because most email
servers will reject your emails as
non-local user.

How do I broadcast messages with fake email headers?

Broadcasting emails with fake or forge headers can be done by the modification of delivery status notification as defined in RFC (Request For Comment) that uses the ESMTP extension mechanism to embed enhanced status codes to provide explanations of error conditions in the context of the delivery status notifications format

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defined in:...
SMTP Simple Mail Transfer Protocol RFC 821 is the guide lines for basic specification of service extension and authentication message submission of Internet host requirements delivery status and notifications on message submission for mailings service extension for returning enhanced error codes to view the list of error return codes or Download a copy of RFC 821

SMTP - Simple Mail Transport Protocol a protocol governing email transmission and reception (sending and receiving emails between mail servers).

Notes: Using invalid email address for sending emails usually result in bounced emails because most mail servers will reject your emails as non-local user (reverse-DNS lookup of the sender IP).

See: Non-existing REPLY TO or fake FROM (sender) email.

Many ISP filters incoming emails and automatically delete mails where the TO address is different from the actual recipient address -- delete not bounced -- hence you won't know if the message actually got to the intended recipient. See: Email Filtering

For more information,
see Email FAQs Glossary

Whois a tool to contact network registries to find out contact information for the current domain or IP address.

Useful Web Sites
Freeware, shareware tools to help you speed-up your Internet connection
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Traceroute tool, finds the route packets take between you and the selected address.

See Email FAQs Glossary for Dig tool, requests all the DNS records for a host or domain for info listed below...

Mail readers, Mailbox, User Agent,
ARP Address Resolution Protocol
NAT Network Address Translation
MAC Media Access Control MAC Address
MTA Message Transfer Agent
Traceroute tool - finds the route packets
Finger program for retrieving Internet user info
Dig tool requests all DNS records for a host/domain
SMTP Relay Verify (checking) tool
Ping Packets Internet Groper
Whois a tool to contact network
nslookup a DNS whois tool that perform forward/reverse DNS queries for a domain
Telnet - A program that allows a user to remotely login
Throughput, MaxMtu, UART, RWIN, MSS,
TTL-Time To Live
ICMP - Internet Control Message Protocol
RFC - Request For Comments
SMTP - Simple Mail Transport Protocol
SMTP return error codes lists
Winsock Error Codes
Port Numbers, Router, Server-time-out,
Mail Host, Mail server, Email gateway
FTP - File Transfer Protocol
UDP - User Datagram Protocol
If you are using your own mail server or using a desktop PCs mail server program?
See: Mail Server FAQs