 SteveI know your IP addressConsultant
join:2001-03-10
Yorba Linda, CA
kudos:5 | reply to tomdlgns
Re: DNS - A, MX and PTR records - Silly quesiton said by tomdlgns: The idea is that the servers listed as secondary MX servers have some out-of-band way of knowing when the primary servers are back online. ETRN is an in-band way of knowing this. |
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| said by Steve:said by tomdlgns: The idea is that the servers listed as secondary MX servers have some out-of-band way of knowing when the primary servers are back online. ETRN is an in-band way of knowing this. sorry, you lost me. |
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SteveI know your IP addressConsultant
join:2001-03-10
Yorba Linda, CA
kudos:5 | When the final mailserver is back up, it can phone home to the backup (via port 25/tcp) and use the ETRN command that essentially says "This would be a great time to scan your outgoing queue", at which time it presumably finds that it can consummate the final delivery.
No out-of-band mechanism required.
Steve
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Stephen J. Friedl | Unix Wizard | Security Consultant | Orange County, California USA | my web site |
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| ok, but were you correcting something i posted or adding more information?
i just copy/pasted from the website and included a link. |
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