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| How to Find Out if My Email is Being Blacklisted? https://forum.linode.com/viewtopic.php?f=11&t=8359 |
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| Author: | geekinthesticks [ Fri Jan 27, 2012 4:19 am ] |
| Post subject: | How to Find Out if My Email is Being Blacklisted? |
I have been running my own mail server for several years with almost no problems sending mail. However, there is one person who has a btinternet.com address who can't receive mail from me. I have checked my server logs and I can see their smtp server accepting the email without any errors, but he never receives it. He has checked his spam folder, but he doesn't receive the email and I don't get any errors at my end. I am about to set up a mailing list where several members have a btinternet.com address. I want to try and find out if the probem is that my email is being black listed. I am using postfix to send email wit the following settings: myhostname = li40-130.members.linode.com mydestination = localhost, li40-130.members.linode.com, localhost.li40-130.members.linode.com My domains have the following spf rrecord: v=spf1 ip4:109.74.196.44/24 mx ?all |
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| Author: | obs [ Fri Jan 27, 2012 8:32 am ] |
| Post subject: | |
Check ww.spamhaus.org that's a reasonably common black list, however the only real way to find out if btinternet have you blacklisted is to ask them. |
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| Author: | AgentOfPork [ Fri Jan 27, 2012 12:26 pm ] |
| Post subject: | |
A site like MXToolbox can run a check again many commonly used blacklists, but because there are so many lists, no one can cover all of them. And as obs said, the only way to know if an individual ISP has you blacklisted is to ask them. Good luck. I know working with Verizon could sometimes be a real pain. And that was when I worked for them! 
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| Author: | Stever [ Fri Jan 27, 2012 1:38 pm ] |
| Post subject: | Re: How to Find Out if My Email is Being Blacklisted? |
geekinthesticks wrote: v=spf1 ip4:109.74.196.44/24 mx ?all
Your linode isn't in that ip4 range, do your domains all use this linode as their MX? |
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| Author: | otherbbs [ Sun Jan 29, 2012 2:09 am ] |
| Post subject: | |
Also your linode IP reverse PTR is set to a domain that does not exist. -- Travis |
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| Author: | hybinet [ Sun Jan 29, 2012 2:24 pm ] |
| Post subject: | Re: How to Find Out if My Email is Being Blacklisted? |
geekinthesticks wrote: v=spf1 ip4:109.74.196.44/24 mx ?all
In addition to issues that others have pointed out, it's a bit odd to put an entire /24 in your SPF record. There could be hundreds of other people in that subnet, and you never know which of them will get their email script hacked one day. "?all" does nothing. A useful SPF record should end with "~all" (safer) or "-all" (more risky). If you also host your domain on the same Linode, the easiest way to write a valid SPF is "a mx ~all". |
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| Author: | geekinthesticks [ Mon Jan 30, 2012 4:21 am ] |
| Post subject: | |
Thanks for all the helpful replies. To summarize: As far as I can tell I am not listed in any blacklists. I should alter my spf record to look something like: 109.74.196.44/32 v=spf1 mx ip4:109.74.196.44/32 ~all My rDNS now resolves to mail.manor-farm.org, which is a valid domain. However, it's not the domain that I'll be using for lists. |
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| Author: | topcoder [ Wed Feb 01, 2012 9:13 pm ] |
| Post subject: | |
Quote: 109.74.196.44/32 v=spf1 mx ip4:109.74.196.44/32 ~all
It should be something like v=spf1 mx a include:linode.com ~all Just use an SPF Wizard like this one Unlock The Inbox SPF Wizard After you get everything set up just send an email to "mailtest@unlocktheinbox.com" it will auto-respond and let you know if you got everything set up right. |
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| Author: | Stever [ Wed Feb 01, 2012 10:29 pm ] |
| Post subject: | |
topcoder wrote: It should be something like
v=spf1 mx a include:linode.com ~all No, it shouldn't. Including linode.com would only make sense if linode provided an outgoing smtp relay, which they don't. |
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| Author: | geekinthesticks [ Thu Feb 02, 2012 11:01 am ] |
| Post subject: | |
Thanks for the link to unlockthebox.com. However, I am obviously doing something wrong, as I can't get it to generate an SPF which it considers valid. For example there is something wrong with the following: Code: v=spf1 a mx mx:mail.manor-farm.org mx: ip4:109.74.196.44 ~all mail.manor-farm has an MX record. The headers of the message show: Code: From li40-130.members.linode.com (mail.manor-farm.org [109.74.196.44]) by unlocktheinbox.com with SMTP; Thu, 2 Feb 2012 09:48:23 -0500 |
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| Author: | hybinet [ Thu Feb 02, 2012 11:30 am ] |
| Post subject: | |
geekinthesticks wrote: For example there is something wrong with the following:
Code: v=spf1 a mx mx:mail.manor-farm.org mx: ip4:109.74.196.44 ~all The dangling "mx:" is probably responsible for the error. |
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| Author: | Stever [ Thu Feb 02, 2012 12:07 pm ] |
| Post subject: | |
geekinthesticks wrote: Code: v=spf1 a mx mx:mail.manor-farm.org mx: ip4:109.74.196.44 ~all mail.manor-farm has an MX record. Code: $ dig +short -t mx mail.manor-farm.org There is no MX for mail.manor-farm.org, but there is one for manor-farm.org. I think you are getting yourself all wrapped up in specifying the same IP in as many different ways as you can think of. The SPF record needs only one entry unless you are actually sending mail from multiple hosts. If you are sending all the mail from the same server, then just pick one method of specifying it's IP address. There is no benefit to specifying a, mx, and ip4 mechanisms if they ultimately all resolve to the same IP. My standard SPF for a domain that I completely control is Code: v=spf1 mx -all But don't use the -all unless you are absolutely certain you know what it means. |
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| Author: | Stever [ Thu Feb 02, 2012 12:19 pm ] |
| Post subject: | |
Also, mail.manor-farm.org != li40-130.members.linode.com Code: $ dig +short li40-130.members.linode.com |
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| Author: | topcoder [ Fri Feb 03, 2012 3:32 pm ] |
| Post subject: | |
Yeah I keep mine simple too I use.. Quote: v=spf1 a mx ~all
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