mail and smtp??

Hi I have configure sendmail , so my linux redhat 8.0 server can send and recevie mail now. But the mail.mydomain.com and smtp.mydomain.com still doesn't work, why?

sendmail should handle mail and smtp, right?

thanks

Have you set up those domains to point to your machine? Have you configured sendmail to accept mail on that domain?

Sendmail does smtp. 'mail' isn't a protocol. If you want POP3 or IMAP you need to install a suitable server, sendmail doesn't do POP3 or IMAP.

[...] [...]

'whois mydomain.com' and 'nslookup -query=MX mydomain.com' show that he's giving bogus info anyway.

I don't know why people always use a valid domain name when they want anonymity, instead of something like 'smtp.my.domain'.

tony

Because like you they are unaware that they should use the reserved top-level domains 'invalid', 'test', or 'example'. See http://www.faqs.org/rfcs/rfc2606.html.

'smtp.my.domain' will force a root server lookup in order to discover that the TLD 'domain' does not exist, thus wasting resources (and you can't be certain there will never be such a TLD). A lookup of 'anything.invalid' will return an immediate failure.

Using things such as 'mydomain.com' on the assumption that no such domain exists is a very bad idea. If you _must_ use 'something.{com|org|net}' use 'example' as it is reserved.

A USENET posting depending on anonymity only requires an obvious invalid top-level domain. No DNS lookups are necessary to realize that. When someone is claiming smtp server problems and they use a valid domain that is not their own, one might connect to the server to help analyze the problem and never see. This particular OP was fairly obvious to use as an example.

As you say, the reserved invalid, test, and example serve the purpose, but it's not at all necessary to use {com|org|net} for illustrative purposes. One can use .domain or .anything which are very obvious fabrications.

tony

does, doesn't,does, doesn't,does, doesn't,does, doesn't,,,,,okay, who do we believe? has ynotssor read the rfc? apparantly not.

this seems like an important issue, but never have seen it discussed outside of IT shops.

There are RFCs about communicating on Usenet? Are you the enforcement cop?