Does it mean that anyone can configure their mail client to use xyz.com as their smtp server and send mails to the users of xyz.com. If this is the
yup.
case and if I specifically set a reject rule to the connecting IP in access file, will the smtp server reject the mail.
if its a static ip - yes. if its a dynamic ip - well, you really shouldnt accept mail sent direct from dynamic ips to your inbound mailserver..
in any case if it is forged mail you have a problem with the best thing to do is to contact the isp of the guy sending these mails and have them follow up.
following up with local isps will be be tough though, 99.9999% of the isps in india - even the largest ones such as satyam / vsnl - have improper SOPs (or even no SOP at all in some cases) for dealing with spammers.
Are the below statements right. - Relay control based on source => access file
yes. source domain or ip
- Relay control based on destination => relay-domains
sort of. relay-domains is a list of domains you accept mail for from any ip whatsoever, but do not deliver locally - you pass it on to another server. this is typically used when you are the backup MX for a domain
- Accepting its own mails => localhostnames
yes
srs
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