Other mail servers will send their emails to james(not only james but other mail servers) by finding it's hostname?
yes. there is a type of DNS record called an MX record. this tells other mail servers which hosts accept mail for a particular domain. not to get into too much detail, but these records have numeric values that allow you to prioritize which servers are to be attempted first.

if true can i name a hostname like davemail shown below? even in a standalone pc?
james will let you call your server whatever you want (if i am not mistaken, the configuration parameter you are talking about below only refers to the name james uses during a conversation), however this has nothing to do with DNS as it pertains to the topic at hand.

        <helloName autodetect="false">davemail.com</helloName>
        <connectiontimeout>120000</connectiontimeout>
>
Is it true inorder to send email and receive email from the real world like yahoo or hotmail i must have a fixed IP?
for all practical terms, yes. anti-spam issues aside, it is very difficult to maintain any kind of usable mails system on a dynamic address because of the requirement that there be an MX record for the server (not to mention that your POP3 client would get very confused :o)

b


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