Author: W B Hacker Date: To: exim users Subject: Re: [exim] Sender callout verification on BATV signed addresses
Richard Salts wrote:
*trimmed* >
> For instance using the BATV domain variant I'd send out emails with a signed
> envelope such as localpart@???. My trick dns server would
> then only publish the record for a specific TAG as a subdomain with a time to
> die of 2 days or so, which should mean there is plenty of time for the mail to
*trimmed*
Is this not the start of yet-another cure that is worse than the disease?
Multiply your 48-hour TTL times by the 100,000 to 1,000,000 messages a medium
sized ISP might transit in 24 hours.
The 'big guys' do *billions* per day.
Your 'trick' DNS is a busy little SOB. Might eventually need a resource pool
greater than that of the mail servers.
Do we even want to think about other nameservers trying to cache those....??
- Which is not at all hard for an MX or PTR RR, commonly with very long ttl...
D' you know dogs?
The day could come when servers also consume so much in the way of time,
network, or machine resources sniffing each other's nether parts or licking
their own that either no resources are left with which to carry the mail - or it
has been diverted indefinitely into the sniffing process.
