 GuspazGuspazPremium,MVM
join:2001-11-05
Montreal, QC
kudos:20 | reply to NytOwl
Re: [Cable] Reason for no Static IP Availability for Cable Inter You can't effectively run a mail server on a dynamic IP, as many (most?) RBLs list dynamic IP ranges. For uptime-critical stuff, even the TTL on dynamic DNS services is too high, although if something is that critical it shouldn't be hosted on a broadband line, business or otherwise.
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Developer: Tomato/MLPPP, Linux/MLPPP, etc »fixppp.org |
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| said by Guspaz:You can't effectively run a mail server on a dynamic IP, as many (most?) RBLs list dynamic IP ranges. For uptime-critical stuff, even the TTL on dynamic DNS services is too high, although if something is that critical it shouldn't be hosted on a broadband line, business or otherwise.
This is incorrect. I have ran a mail server for 10 years on a non-static IP without issues. |
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| quote:
This is incorrect. I have ran a mail server for 10 years on a non-static IP without issues.
That was correct. And this is why |
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| said by UnixMan: quote:
This is incorrect. I have ran a mail server for 10 years on a non-static IP without issues.
That was correct. And this is why Post all the links you want. The fact that it is running means it works. |
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| reply to UnixMan
said by UnixMan: quote:
This is incorrect. I have ran a mail server for 10 years on a non-static IP without issues.
That was correct. And this is why Sorry I don't click links. And I am running one so I know it works. |
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| said by 80289148:said by UnixMan: quote:
This is incorrect. I have ran a mail server for 10 years on a non-static IP without issues.
That was correct. And this is why Sorry I don't click links. And I am running one so I know it works. I'll click it for you:
Why mail to and from a dynamic DNS Host does not work reliably
No matter what they tell you, mail to and from dynamic DNS Hosts does not work reliably.
At least without TLS it isn't. Here's how it works with TLS: »www.thalmann.de/postfix-dialup.html
Receiving mail
Why receiving mail does not work reliably:
If you register your dynamic IP in a dynamic DNS provider like dyndns.org, your dyndns.org hostname is assigned your dynamic IP
If your machine loses the internet connectivity, then the hostname will still point to your former IP.
Now somebody else gets your former IP:
The computer has nothing listening on port 25:
No problem!
The computer has a properly setup MTA on port 25:
Your mail will be bounced! This is bad.
The computer has an open relay MTA on port 25:
Your mail will be relayed by this machine.
The computer has a blackhole MTA.
Your mail will be lost! This is bad.
Sending mail
Why sending mail does not work reliably:
Nowadays, many providers don't accept mail from dynamically assigned IP pools (like your dialup / DSL IP range). This means you must use the relayhost of your ISP.
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MNSi Internet - »www.mnsi.net |
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 InssomniakThe GlitchPremium
join:2005-04-06
Cayuga, ON
kudos:1 | ^^ Everything HeadSpinning said.. |
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 LeathalPremium
join:2002-02-09
M1S0G4
kudos:2 | reply to Guspaz
said by Guspaz:You can't effectively run a mail server on a dynamic IP, as many (most?) RBLs list dynamic IP ranges. For uptime-critical stuff, even the TTL on dynamic DNS services is too high, although if something is that critical it shouldn't be hosted on a broadband line, business or otherwise.
To tell you truth this isn't entirely true as most ISPs including Teksavvy allow for SMTP relay from users on their network. Which is what I do and haven't had any problems for the last 2 almost 3 years. |
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LeathalPremium
join:2002-02-09
M1S0G4
kudos:2 | reply to UnixMan
said by UnixMan: quote:
This is incorrect. I have ran a mail server for 10 years on a non-static IP without issues.
That was correct. And this is why This info is only valid if you ISP doesn't allow you to relay your emails through their SMTP servers. Otherwise its not valid. |
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brad
join:2007-09-06
Etobicoke, ON | said by Leathal:This info is only valid if you ISP doesn't allow you to relay your emails through their SMTP servers. Otherwise its not valid.
The comments are about attempting to deliver mail directly from an address within a dynamic block. |
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brad
join:2007-09-06
Etobicoke, ON | reply to Leathal
said by Leathal:To tell you truth this isn't entirely true as most ISPs including Teksavvy allow for SMTP relay from users on their network. Which is what I do and haven't had any problems for the last 2 almost 3 years.
It is true if you understand that the discussion was about NOT relaying through your ISPs mail server. That would have been pretty obvious from the thread. |
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LeathalPremium
join:2002-02-09
M1S0G4
kudos:2 | said by brad:said by Leathal:To tell you truth this isn't entirely true as most ISPs including Teksavvy allow for SMTP relay from users on their network. Which is what I do and haven't had any problems for the last 2 almost 3 years.
It is true if you understand that the discussion was about NOT relaying through your ISPs mail server. That would have been pretty obvious from the thread. Yes but people brought up in this thread that sending email would be an issue. I am adding my 2 cents.
Thanks.. helps if you read the threads fully  |
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