I need to relay an email received to an SMTP server to multiple other emails. I would like to keep all the original content, header, from email and ip address. Is this possible and what service or open source software can I use for this? I'd like to have an API option, don't care about spam filter or anything else, I only need a simple relay/redirect.
Example:
Email A from SenderA is sent to SenderB (SMTP Proxy)
SenderB (SMTP Proxy) redirects email to SenderC and SenderD