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SPF syntax correct?

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gng at hassard

Jan 15, 2007, 10:18 AM

Post #26 of 40 (4705 views)
Permalink

RE: SPF syntax correct? [In reply to]

You probably don't have a reverse DNS entry for your MX record... I had
the same problem with a couple of my Customers using XO communications..
Some ant-spam programs will give you that exact error message if they
cannot resolve your mail address (name) back to an IP address.

Graham

-----Original Message-----
From: eslbase [mailto:eslbase [at] eslbase]
Sent: Monday, January 15, 2007 10:06 AM
To: spf-help [at] v2
Subject: Re: [spf-help] SPF syntax correct? [sls][cty][faked-from]

>> Thanks to all of you for your help - my host has finally changed my
>> SPF record to
>>
>> "v=spf1 ip4:66.232.130.50 ip4:66.232.135.20 ip4:66.232.129.245
>> ip4:66.232.129.12 ip4:66.232.129.247 ip4:66.232.129.248
>> ip4:66.232.129.249 ip4:66.232.129.250 -all"
>>
>> and this seems to be doing the trick.

The number of bounces I'm getting now with this new SPF record has
almost completely disappeared. I'm experiencing a different problem
though - I'm not sure if it's relevant here - please tell me if it's
not.

I sent a test email at emailreach.com and it was flagged by SpamAssassin
apparently because it was sent by a dynamic IP address (82.57.164.222).
I'm in Italy and using Outlook Express, so this is presumably an IP
address given to me by Telecom Italia. I was under the impression that
servers receiving email would ignore this, and only be interested in
66.232.130.50, the IP of my domain. Am I missing something? If so, how
can I overcome this?

Many thanks, Keith

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eslbase at eslbase

Jan 15, 2007, 10:44 AM

Post #27 of 40 (4706 views)
Permalink

Re: SPF syntax correct? [In reply to]

> You probably don't have a reverse DNS entry for your MX record... I had
> the same problem with a couple of my Customers using XO communications..
> Some ant-spam programs will give you that exact error message if they
> cannot resolve your mail address (name) back to an IP address.
>
> Graham

Thanks Graham

Here's what my DNS report says:

OK. The IPs of all of your mail server(s) have reverse DNS (PTR) entries.
RFC1912 2.1 says you should have a reverse DNS for all your mail servers. It
is strongly urged that you have them, as many mailservers will not accept
mail from mailservers with no reverse DNS entry. Note that this information
is cached, so if you changed it recently, it will not be reflected here (see
the www.DNSstuff.com Reverse DNS Tool for the current data). The reverse DNS
entries are:

50.130.232.66.in-addr.arpa cmlapp01.csee.securepod.com. [TTL=7635]

So it looks like my mail server has a reverse DNS - good. But do I also need
one for all the IPs that I use to send mail? My SPF is "v=spf1
ip4:66.232.130.50 ip4:66.232.135.20 ip4:66.232.129.245 ip4:66.232.129.12
ip4:66.232.129.247 ip4:66.232.129.248 ip4:66.232.129.249
ip4:66.232.129.250 -all"

...so should I have reverse DNS entries for all those other ip4's?

Many thanks, Keith

>>> Thanks to all of you for your help - my host has finally changed my
>>> SPF record to
>>>
>>> "v=spf1 ip4:66.232.130.50 ip4:66.232.135.20 ip4:66.232.129.245
>>> ip4:66.232.129.12 ip4:66.232.129.247 ip4:66.232.129.248
>>> ip4:66.232.129.249 ip4:66.232.129.250 -all"
>>>
>>> and this seems to be doing the trick.
>
> The number of bounces I'm getting now with this new SPF record has
> almost completely disappeared. I'm experiencing a different problem
> though - I'm not sure if it's relevant here - please tell me if it's
> not.
>
> I sent a test email at emailreach.com and it was flagged by SpamAssassin
> apparently because it was sent by a dynamic IP address (82.57.164.222).
> I'm in Italy and using Outlook Express, so this is presumably an IP
> address given to me by Telecom Italia. I was under the impression that
> servers receiving email would ignore this, and only be interested in
> 66.232.130.50, the IP of my domain. Am I missing something? If so, how
> can I overcome this?
>
> Many thanks, Keith
>
>
> -------
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gng at hassard

Jan 15, 2007, 10:55 AM

Post #28 of 40 (4696 views)
Permalink

RE: SPF syntax correct? [In reply to]

Yes..

We use an anti-spam program that checks the reverse DNS for EVERY
incoming e-mail and will fail the e-mail if it doesn't have one.. So, if
you are sending mail from multiple servers as your SPF record indicates,
then you will need a reverse DNS entry for each address... Even if you
only have one Domain name for your email, I.e. mymail.com.. If you have
multiple IP addresses that can send mail on behalf of that Domain, then
each IP address should be resolved to that name.. I hope that makes
sense.

Graham

-----Original Message-----
From: eslbase [mailto:eslbase [at] eslbase]
Sent: Monday, January 15, 2007 10:44 AM
To: spf-help [at] v2
Subject: Re: [spf-help] SPF syntax correct? [sls][cty][faked-from]

> You probably don't have a reverse DNS entry for your MX record... I
> had the same problem with a couple of my Customers using XO
communications..
> Some ant-spam programs will give you that exact error message if they
> cannot resolve your mail address (name) back to an IP address.
>
> Graham

Thanks Graham

Here's what my DNS report says:

OK. The IPs of all of your mail server(s) have reverse DNS (PTR)
entries.
RFC1912 2.1 says you should have a reverse DNS for all your mail
servers. It is strongly urged that you have them, as many mailservers
will not accept mail from mailservers with no reverse DNS entry. Note
that this information is cached, so if you changed it recently, it will
not be reflected here (see the www.DNSstuff.com Reverse DNS Tool for the
current data). The reverse DNS entries are:

50.130.232.66.in-addr.arpa cmlapp01.csee.securepod.com. [TTL=7635]

So it looks like my mail server has a reverse DNS - good. But do I also
need one for all the IPs that I use to send mail? My SPF is "v=spf1
ip4:66.232.130.50 ip4:66.232.135.20 ip4:66.232.129.245 ip4:66.232.129.12
ip4:66.232.129.247 ip4:66.232.129.248 ip4:66.232.129.249
ip4:66.232.129.250 -all"

...so should I have reverse DNS entries for all those other ip4's?

Many thanks, Keith

>>> Thanks to all of you for your help - my host has finally changed my
>>> SPF record to
>>>
>>> "v=spf1 ip4:66.232.130.50 ip4:66.232.135.20 ip4:66.232.129.245
>>> ip4:66.232.129.12 ip4:66.232.129.247 ip4:66.232.129.248
>>> ip4:66.232.129.249 ip4:66.232.129.250 -all"
>>>
>>> and this seems to be doing the trick.
>
> The number of bounces I'm getting now with this new SPF record has
> almost completely disappeared. I'm experiencing a different problem
> though - I'm not sure if it's relevant here - please tell me if it's
> not.
>
> I sent a test email at emailreach.com and it was flagged by
> SpamAssassin apparently because it was sent by a dynamic IP address
(82.57.164.222).
> I'm in Italy and using Outlook Express, so this is presumably an IP
> address given to me by Telecom Italia. I was under the impression that

> servers receiving email would ignore this, and only be interested in
> 66.232.130.50, the IP of my domain. Am I missing something? If so,
> how can I overcome this?
>
> Many thanks, Keith
>
>
> -------
> Archives at http://archives.listbox.com/spf-help/current/ or
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> unsubscribe, change your address, or temporarily deactivate your
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steve at teamITS

Jan 15, 2007, 11:14 AM

Post #29 of 40 (4685 views)
Permalink

RE: SPF syntax correct? [In reply to]

eslbase <mailto:eslbase [at] eslbase> wrote on Monday, January 15, 2007
12:44 PM:

> ...so should I have reverse DNS entries for all those other ip4's?

Yes, many ISPs now block dynamic IPs or those without reverse
DNS. For example:

http://postmaster.aol.com/guidelines/bestprac.html

-----
SPF FAQ: http://www.openspf.org/FAQ
Common mistakes: http://www.openspf.org/FAQ/Common_mistakes

- Steve Yates
- ITS, Inc.
- Ah... aah... aaah... atchouw2XO1:4,&bKx NO CARRIER

~ Taglines by Taglinator - www.srtware.com ~

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eslbase at eslbase

Jan 15, 2007, 12:10 PM

Post #30 of 40 (4707 views)
Permalink

Re: SPF syntax correct? [In reply to]

> ...so should I have reverse DNS entries for all those other ip4's?

> Yes, many ISPs now block dynamic IPs or those without reverse
> DNS. For example:

> http://postmaster.aol.com/guidelines/bestprac.html

Thanks Steve and Graham.

I'm about to email my host to ask them to add reverse DNS records for all of
the ip4's. Is there any reason why they shouldn't be able to add them to the
DNS? (I ony ask because of their reluctance last week to correct my SPF -
they corrected it immediately when I told them what I'd found out from this
forum, so hopefully they'll be as accommodating this time!)

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gng at hassard

Jan 15, 2007, 12:20 PM

Post #31 of 40 (4711 views)
Permalink

RE: SPF syntax correct? [In reply to]

They should have ZERO problems with this... It's very easy...

You might want to find out ifyour ISP has any way for you to manage your
DNS... I have a Web base control panel that allows me to edit my own
DNS, including .txt records etc... Makes dealing with the ongoing
maintenance of your DNS based stuff so much easier when you can change
it yourself.

Graham

-----Original Message-----
From: eslbase [mailto:eslbase [at] eslbase]
Sent: Monday, January 15, 2007 12:11 PM
To: spf-help [at] v2
Subject: Re: [spf-help] SPF syntax correct? [sls][cty][faked-from]

> ...so should I have reverse DNS entries for all those other ip4's?

> Yes, many ISPs now block dynamic IPs or those without reverse DNS.
> For example:

> http://postmaster.aol.com/guidelines/bestprac.html

Thanks Steve and Graham.

I'm about to email my host to ask them to add reverse DNS records for
all of the ip4's. Is there any reason why they shouldn't be able to add
them to the DNS? (I ony ask because of their reluctance last week to
correct my SPF - they corrected it immediately when I told them what I'd
found out from this forum, so hopefully they'll be as accommodating this
time!)

-------
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eslbase at eslbase

Jan 16, 2007, 10:13 AM

Post #32 of 40 (4715 views)
Permalink

Re: SPF syntax correct? [In reply to]

> ...so should I have reverse DNS entries for all those other ip4's?

Yes, many ISPs now block dynamic IPs or those without reverse
DNS. For example:

http://postmaster.aol.com/guidelines/bestprac.html

My host has replied to my request to add reverse DNS for all IPs, and said
that it is already set up for all of them. Here's their reply:

We can confirm that the following PTR records are already set.

host 66.232.129.245
245.129.232.66.in-addr.arpa domain name pointer...

...It repeats the same for all the other IPs.

Does this sound right? Can I take their word for it? I can't see any
mention of this in my DNS record (I don't really know what I'm looking for).
Should it be in my DNS record?

Many thanks, Keith

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velvetpixel at mac

Jan 16, 2007, 11:27 AM

Post #33 of 40 (4715 views)
Permalink

Re: SPF syntax correct? [In reply to]

On Jan 16, 2007, at 10:13 AM, eslbase wrote:

>
>> ...so should I have reverse DNS entries for all those other ip4's?
>
> Yes, many ISPs now block dynamic IPs or those without reverse
> DNS. For example:
>
> http://postmaster.aol.com/guidelines/bestprac.html
>
>
> My host has replied to my request to add reverse DNS for all IPs, and
> said that it is already set up for all of them. Here's their reply:
>
> We can confirm that the following PTR records are already set.
>
> host 66.232.129.245
> 245.129.232.66.in-addr.arpa domain name pointer...
>
> ...It repeats the same for all the other IPs.
>
> Does this sound right? Can I take their word for it? I can't see any
> mention of this in my DNS record (I don't really know what I'm looking
> for). Should it be in my DNS record?
>
> Many thanks, Keith
>
>
>
>
>
> -------
> Archives at http://archives.listbox.com/spf-help/current/ or
> http://www.gossamer-threads.com/lists/spf/help/ (easier to search)
> To unsubscribe, change your address, or temporarily deactivate your
> subscription, please go to
> http://v2.listbox.com/member/?&
>
>
You can check things like this here:

http://www.dnsreport.com

Just enter your domain on the DNS Report side and click the button and
it will show you lots of info about your DNS including if Reverse is
enabled.

Cameron

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steve at teamITS

Jan 16, 2007, 11:40 AM

Post #34 of 40 (4724 views)
Permalink

RE: SPF syntax correct? [In reply to]

eslbase <mailto:eslbase [at] eslbase> wrote on Tuesday, January 16, 2007
12:14 PM:

> host 66.232.129.245
> 245.129.232.66.in-addr.arpa domain name pointer...
>
> ...It repeats the same for all the other IPs.
>
> Does this sound right? Can I take their word for it? I can't see any
> mention of this in my DNS record (I don't really know what I'm looking
for).
> Should it be in my DNS record?

No, it should not be in your domain's DNS zone file. You can
however look up the IP using

nslookup 66.232.129.245

...and if it answers with a name (rama1.relay.securepod.com) then
reverse DNS is set up. For purposes of sending mail, the name that is
assigned is not relevant, it just has to resolve to something.

-----
SPF FAQ: http://www.openspf.org/FAQ
Common mistakes: http://www.openspf.org/FAQ/Common_mistakes

- Steve Yates
- ITS, Inc.
- "I need a home run hitter," Tom said ruthlessly.

~ Taglines by Taglinator - www.srtware.com ~

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eslbase at eslbase

Jan 16, 2007, 2:26 PM

Post #35 of 40 (4700 views)
Permalink

Re: SPF syntax correct? [In reply to]

> host 66.232.129.245
> 245.129.232.66.in-addr.arpa domain name pointer...
>
> ...It repeats the same for all the other IPs.
>
> Does this sound right? Can I take their word for it? I can't see any
> mention of this in my DNS record (I don't really know what I'm looking
for).
> Should it be in my DNS record?

> No, it should not be in your domain's DNS zone file. You can
> however look up the IP using
>
> nslookup 66.232.129.245
>
> ...and if it answers with a name (rama1.relay.securepod.com) then
> reverse DNS is set up. For purposes of sending mail, the name that is
> assigned is not relevant, it just has to resolve to something.

I'm not sure how to do an nslookup...can you help?

Thanks, Keith

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alex at ergens

Jan 16, 2007, 2:40 PM

Post #36 of 40 (4687 views)
Permalink

Re: SPF syntax correct? [In reply to]

On Tue, Jan 16, 2007 at 01:40:04PM -0600, Steve Yates wrote:

> ...and if it answers with a name (rama1.relay.securepod.com) then
> reverse DNS is set up. For purposes of sending mail, the name that is
> assigned is not relevant, it just has to resolve to something.

I'm not 100% sure, but I do think it does make a difference.

Please correct me if I'm wrong...

mail.example.com. A 192.0.2.1
mailhost.customer.example. A 192.0.2.1
customer.example. TXT "v=spfX ptr -all"

Mail is sent from 192.0.2.1 using MAIL FROM:<any [at] customer>
Of course, customer expects this to work, as his hostname is ending
in "customer.example" and thus matches "ptr", right ?

Case#1:
1.2.0.192.in-addr.arpa. PTR mailhost.customer.example.

Result: SPF PASS.

Case#2:
1.2.0.192.in-addr.arpa. PTR mail.example.com.

Result: SPF FAIL.

The, no let me rephrase that: __*>*THE*<*___ host's name is the one that
PTR is pointing to (on the Internet).

Big ISPs like AOL and Hotmail, as well as programs such as spamassassin,
may also look at the name. It may tip the balance in the opposite direction
if you are at or near a threshold already.

Alex

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alex at ergens

Jan 16, 2007, 2:44 PM

Post #37 of 40 (4692 views)
Permalink

Re: SPF syntax correct? [In reply to]

On Tue, Jan 16, 2007 at 11:26:53PM +0100, eslbase wrote:

> I'm not sure how to do an nslookup...can you help?

Several sites on the internet exist that help you with this.
You were already given one (a couple of posts back).

However:

$ nslookup 66.232.129.245

Non-authoritative answer:
245.129.232.66.in-addr.arpa name = rama1.relay.securepod.com.

Authoritative answers can be found from:
129.232.66.in-addr.arpa nameserver = ns.siteprotect.com.
129.232.66.in-addr.arpa nameserver = ns2.siteprotect.com.
ns.siteprotect.com internet address = 64.26.0.23
ns2.siteprotect.com internet address = 64.26.38.2

An answer is given.

$ nslookup rama1.relay.securepod.com.

Non-authoritative answer:
Name: rama1.relay.securepod.com
Address: 66.232.129.245

Looking up the other direction results in the same IP address. This
may not be important for some, but it is very important for others.

Alex

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steve at teamITS

Jan 16, 2007, 3:15 PM

Post #38 of 40 (4693 views)
Permalink

RE: SPF syntax correct? [In reply to]

Alex van den Bogaerdt <mailto:alex [at] ergens> wrote on Tuesday,
January 16, 2007 4:40 PM:

> On Tue, Jan 16, 2007 at 01:40:04PM -0600, Steve Yates wrote:
>
>> ...and if it answers with a name (rama1.relay.securepod.com) then
>> reverse DNS is set up. For purposes of sending mail, the name that
is
>> assigned is not relevant, it just has to resolve to something.
>
> I'm not 100% sure, but I do think it does make a difference.

Hi Alex,

I was actually speaking towards the requirement of having a
reverse DNS lookup, and not thinking about SPF using the ptr modifier.
In most situations I've run across if the receiver detects the sending
IP doesn't have a reverse DNS record, they may reject the message...it
doesn't matter what the reverse DNS *is*, they just want it to exist.
It would be ideal to have the forward and reverse DNS match, but many
ISPs just set up dummy names like ip-__-__-__-__.something.example.net.

-----
SPF FAQ: http://www.openspf.org/FAQ
Common mistakes: http://www.openspf.org/FAQ/Common_mistakes

- Steve Yates
- ITS, Inc.
- The secrecy of my job prevents me from knowing what I do.

~ Taglines by Taglinator - www.srtware.com ~

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steve at teamITS

Jan 16, 2007, 3:16 PM

Post #39 of 40 (4716 views)
Permalink

RE: SPF syntax correct? [In reply to]

eslbase <mailto:eslbase [at] eslbase> wrote on Tuesday, January 16, 2007
4:27 PM:

>> nslookup 66.232.129.245
>>
> I'm not sure how to do an nslookup...can you help?

You appear to be on Windows (I assume XP), so you can open a
Command Prompt and type in the above command.

-----
SPF FAQ: http://www.openspf.org/FAQ
Common mistakes: http://www.openspf.org/FAQ/Common_mistakes

- Steve Yates
- ITS, Inc.
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eslbase at eslbase

Jan 17, 2007, 12:19 AM

Post #40 of 40 (4690 views)
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Re: SPF syntax correct? [In reply to]

>> nslookup 66.232.129.245
>>
> I'm not sure how to do an nslookup...can you help?

>You appear to be on Windows (I assume XP), so you can open a
>Command Prompt and type in the above command.

Thanks everyone

Keith

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