Re: [Dspam-user] DSPAM server relaying to several IMAP servers

[Orkhan Gasimov]

In fact, I used your advice: instead of using perdition or something 
else as an IMAP proxy for DSPAM, I used Postfix as an IMAP proxy for 
DSPAM. Now the scheme is like this:

letter ==> Postfix VM1 or Postfix VM2 ==> (DSPAM VM with Local Postfix) 
==> IMAP VM1 or IMAP VM2 ==> directory.

And it works! Thanks.

31-Mar-15 16:34, Eric Broch пишет:
> On 3/30/2015 11:39 PM, Орхан Касумов wrote:
>> what's the point of reinjecting back to an SMTP server? Even though
>> configuration files of Postfix allow to specify further recipient as
>> an FQDN record
> Because it's normal. That's what SMTP servers are made for.
>
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Re: [Dspam-user] DSPAM server relaying to several IMAP servers

[Eric Broch]

On 3/30/2015 11:39 PM, Орхан Касумов wrote:
> what's the point of reinjecting back to an SMTP server? Even though
> configuration files of Postfix allow to specify further recipient as
> an FQDN record
Because it's normal. That's what SMTP servers are made for.

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Re: [Dspam-user] DSPAM server relaying to several IMAP servers

[Орхан Касумов]

 The ultimate goal is to achieve full redundancy and avoid a single point of 
failure. For that purpose I use 2 separate VMs for 2 MX servers,
2 separate VMs for 2 IMAP servers, and currently 1 VM for 1 DSPAM server (but 2 
planned). In addition, DNS servers has a record that resolves to
IPs of both MX-es, and MX-es specify further recipient in their config as an 
FQDN record; that FQDN also resolves to 2 IPs (of 2 DSPAM servers - 
one existing and another one planned); as only one DSPAM server is currently 
present, it's the only one receiving messages from any of MX-es.
The DSPAM server then sends the message further to an IMAP server. With that 
said,

what's the point of reinjecting back to an SMTP server? Even though 
configuration files of Postfix allow to specify further recipient as an FQDN 
record
(which can resolve to multiple IPs to avoid a single point of failure), no 
matter where DSPAM sends the message - it's a single point of failure,
because DSPAM takes only one IP address as "DeliveryHost".

I want to achieve a situation when DSPAM tries to send the message to one 
location (IMAP server or even back to SMTP server), and if it's unavailable,
then DSPAM tries to send the message to another location. Maybe I'm wrong, but 
I think that if dspam.conf allowed to write an FQDN
(which would resolve to multiple IPs) as "DeliveryHost", then that goal could 
be achieved (or not?).

Using an IMAP proxy seems logical to me only if the proxy is on the same VM as 
the DSPAM server, otherwise it's also a single point of failure.
Probably I'll try it that way, because using this syntax:

DeliveryHost.example.com    192.168.1.10
DeliveryHost.example.com    192.168.1.20

led to error messages and non-working configuration (I was experimenting, but 
understood that the syntax is not valid).


Понедельник, 30 марта 2015, 13:27 -06:00 от Eric Broch 
:
>Why can't you reinject into an smtp
  server?
>
>On 3/30/2015 12:08 PM, Orkhan Gasimov wrote:
>>Thanks for the quick answer! I've never used such a
setup, but if it's the only way, then I'll surely try. Do you
know a verified link describing something like that?
>>Thanks in advance!
>>Отправлено от  Type Mail
>>На 30.03.2015, в 18:22,  "k...@rice.edu" < k...@rice.edu > написал:п
>>>On Mon, Mar 30, 2015 at 04:08:56PM +0300, Орхан Касумов wrote:
 
 In my setup, DSPAM server receives mails from several MX servers and relays 
them to a single IMAP server.
 The IMAP server's:
 - IP address is the "DeliveryHost"
 - and its DNS name is the "DeliveryIdent"
 in DSPAM's configuration file.
 The question is: is it possible to use several IMAP servers in this scenario? 
I can make "DeliveryIdent" point at a DNS record that resolves to several IP 
addresses, but how can I tell DSPAM to use several "DeliveryHosts"? It doesn't 
support either this:
 DeliveryHost 192.168.1.10 192.168.1.20
 or this:
 DeliveryHost 192.168.1.10
 DeliveryHost 192.168.1.20
 Is there a
way to make DSPAM relay mails to several IMAP servers?
 Thanks in advance!
>>>

Hi,

Can you use an IMAP proxy like perdition or nginx to connect to the various
backend IMAP servers?

Regards,
Ken

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Re: [Dspam-user] DSPAM server relaying to several IMAP servers

[Eric Broch]

Why can't you reinject into an smtp server?

On 3/30/2015 12:08 PM, Orkhan Gasimov wrote:
>
> Thanks for the quick answer! I've never used such a setup, but if it's
> the only way, then I'll surely try. Do you know a verified link
> describing something like that?
>
> Thanks in advance!
>
> Отправлено от Type Mail 
>
> На 30.03.2015, в 18:22, "k...@rice.edu"  > написал:п
>
> On Mon, Mar 30, 2015 at 04:08:56PM +0300, Орхан Касумов wrote:
>
> In my setup, DSPAM server receives mails from several MX
> servers and relays them to a single IMAP server. The IMAP
> server's: - IP address is the "DeliveryHost" - and its DNS
> name is the "DeliveryIdent" in DSPAM's configuration file. The
> question is: is it possible to use several IMAP servers in
> this scenario? I can make "DeliveryIdent" point at a DNS
> record that resolves to several IP addresses, but how can I
> tell DSPAM to use several "DeliveryHosts"? It doesn't support
> either this: DeliveryHost 192.168.1.10 
> 192.168.1.20  or this: DeliveryHost
> 192.168.1.10  DeliveryHost 192.168.1.20
>  Is there a way to make DSPAM relay mails
> to several IMAP servers? Thanks in advance! 
>
>
>
> Hi,
>
> Can you use an IMAP proxy like perdition or nginx to connect to the 
> various
> backend IMAP servers?
>
> Regards,
> Ken
>
> 
>
> Dive into the World of Parallel Programming The Go Parallel Website, 
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> by Intel and developed in partnership with Slashdot Media, is your hub 
> for all
> things parallel software development, from weekly thought leadership 
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>
>
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Re: [Dspam-user] DSPAM server relaying to several IMAP servers

[Sebastian Toepfer]

Am 2015-03-30 15:18, schrieb k...@rice.edu:
> On Mon, Mar 30, 2015 at 04:08:56PM +0300, Орхан Касумов wrote:
> 
> In my setup, DSPAM server receives mails from several MX servers and 
> relays them to a single IMAP server.
> The IMAP server's:
> - IP address is the "DeliveryHost"
> - and its DNS name is the "DeliveryIdent"
> in DSPAM's configuration file.
> The question is: is it possible to use several IMAP servers in this 
> scenario? I can make "DeliveryIdent" point at a DNS record that 
> resolves to several IP addresses, but how can I tell DSPAM to use 
> several "DeliveryHosts"? It doesn't support either this:
> DeliveryHost 192.168.1.10 192.168.1.20
> or this:
> DeliveryHost 192.168.1.10
> DeliveryHost 192.168.1.20
> Is there a way to make DSPAM relay mails to several IMAP servers?
> Thanks in advance!
> 
> 
> Hi,
> 
> Can you use an IMAP proxy like perdition or nginx to connect to the 
> various
> backend IMAP servers?
> 
> Regards,
> Ken
> 
Hi,

or use the dspam way, see the readme:

# If you would like to set up DeliveryHost's on a per-domain basis, use
# the syntax: DeliveryHost.domain.com 1.2.3.4

not try it out, but think it should work.

Regards,
Sebastian

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Re: [Dspam-user] DSPAM server relaying to several IMAP servers

[Orkhan Gasimov]

Thanks for the quick answer! I've never used such a setup, but if it's the only 
way, then I'll surely try. Do you know a verified link describing something 
like that?

Thanks in advance!

Отправлено от Type Mail



На 18:22, 30.03.2015, в 18:22, "k...@rice.edu"  написал:п>On 
Mon, Mar 30, 2015 at 04:08:56PM +0300, Орхан Касумов wrote:
>> 
>> In my setup, DSPAM server receives mails from several MX servers and
>relays them to a single IMAP server.
>> The IMAP server's:
>> - IP address is the "DeliveryHost"
>> - and its DNS name is the "DeliveryIdent"
>> in DSPAM's configuration file.
>> The question is: is it possible to use several IMAP servers in this
>scenario? I can make "DeliveryIdent" point at a DNS record that
>resolves to several IP addresses, but how can I tell DSPAM to use
>several "DeliveryHosts"? It doesn't support either this:
>> DeliveryHost 192.168.1.10 192.168.1.20
>> or this:
>> DeliveryHost 192.168.1.10
>> DeliveryHost 192.168.1.20
>> Is there a way to make DSPAM relay mails to several IMAP servers?
>> Thanks in advance!
>
>
>Hi,
>
>Can you use an IMAP proxy like perdition or nginx to connect to the
>various
>backend IMAP servers?
>
>Regards,
>Ken
>
>--
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>the 
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Re: [Dspam-user] DSPAM server relaying to several IMAP servers

[k...@rice.edu]

On Mon, Mar 30, 2015 at 04:08:56PM +0300, Орхан Касумов wrote:
> 
> In my setup, DSPAM server receives mails from several MX servers and relays 
> them to a single IMAP server.
> The IMAP server's:
> - IP address is the "DeliveryHost"
> - and its DNS name is the "DeliveryIdent"
> in DSPAM's configuration file.
> The question is: is it possible to use several IMAP servers in this scenario? 
> I can make "DeliveryIdent" point at a DNS record that resolves to several IP 
> addresses, but how can I tell DSPAM to use several "DeliveryHosts"? It 
> doesn't support either this:
> DeliveryHost 192.168.1.10 192.168.1.20
> or this:
> DeliveryHost 192.168.1.10
> DeliveryHost 192.168.1.20
> Is there a way to make DSPAM relay mails to several IMAP servers?
> Thanks in advance!


Hi,

Can you use an IMAP proxy like perdition or nginx to connect to the various
backend IMAP servers?

Regards,
Ken

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