Topic: ETRN vs MultiDrop

[Graham]

Which is more appropriate for periodic analogue modem dialup collection
from a pop3 mailbox at ISP ?

How would I know if ISP supports either OR is it not a case of what they
support just a different method SME can use ?

Thanks !

[Pat Erler]

ETRN is by far the better method - unfortunately it definitely needs a static IP, do with dialup you need to go the multidrop way..

PAT

[Ed Form]

Pat Erler wrote:
>
> ETRN is by far the better method - unfortunately it
> definitely needs a static IP, do with dialup you need to go
> the multidrop way..

No you don't. A static IP address and ETRN are perfectly usable with a dialup connection. The big advantage of ETRN is that the headers remain intact and stuff like mailing list messages can be properly sorted to the correct recipient.

Ed Form

[Graham]

How can I tell what the ISP uses ?

Or am I asking the wrong question ?

I am pretty sure its dynamic IP anyway . . .

[Ed Form]

Graham wrote:
>
>
> How can I tell what the ISP uses ?
>
> Or am I asking the wrong question ?
>
> I am pretty sure its dynamic IP anyway . . .

If you can use email addresses of the form anyone@yourdomain.xxx and you do not have a static IP address, for which you would probably have been asked to pay, then you have multidrop.

Ed Form

[Kelvin]

Hi Graham,

Just give your ISP a call and see if they will support ETRN. As Ed mentioned earlier, ETRN works perfectly well with dynamic IPs.

Basically, the ETRN mechanism works by contacting a supporting server at the ISP end (so your ISP must support this for this to work), and say, "Hey, could you please send me all my waiting mail on the IP address that this request came in on ?". The server then just looks at your request and the IP address that it came from and proceeds to send all your waiting mail to that IP address. This is the "recommended" method used by M$ X-change servers.

Kelvin

[Graham]

I can mail them I guess [someone, not me chose the ISP] which is in Germany
and we are in UK.

I chose Multidrop in SME, more becasue thats what I had done in the past
and it worked.

Its working now ok, after that strange startmail / fetchmail episode / workaround but am still gettiing the occasional :-

"fetchmail: couldn't find canonical DNS name of mail.ourisp.com"

Its not always on the hour though [pick up is scheduled for hourly]

I have scoured the groups again and there seem to be two different theories:-

1) Its to do with Timming [Analogue modem takes a while to get IP]
2) Its to do with DNS [I wont pretend to understand]

For 1) someone suggested changing all my on hook times to medium
For 2) someone suggested entering the IP of mail.ourisp.com

I think Kelvin may know the reasons and how to solve / workaround this one !

Thanks !

As a side a ping of our mail.ourisp.com returns no packets altho Neotrace
seems to come back with some fairly detailed info even though loss is 100%

Are they blocking ping requests or putting them in the bit buccket ?

Would this have anything to do with messages above ?

Maybe they got stealth / firewall ?

[Graham]

Part two :-

Whatd does ETRN stand for ?

Thanks guys !

[Andy Parkinson]

Enhanced Turn
Turn works by sending mail to the smtp server (the isp's) and then sending a turn command. ie telling the ISP server to turn the other way and send instead of receiving. Enhanced turn is the succesor to turn and runs on SMTP servers that can support ESMTP Enhanced Simple Mail Transfer Protocol. The difference between the two is that Turn requires authentification. I always have understood that even when using Turn or ETRN you would need a static IP address which is normally allocated to you even when using dial up. If this is incorrect I would be interested to know if anyone can enlighten me.

Graham wrote:
>
> Part two :-
>
> Whatd does ETRN stand for ?
>
> Thanks guys !