I'm having a problem with a customer that can't send emails from a network: outlook goes into timeout and we can't reach the webmail site.
We don't get a bounce message like "550 Rejected: xxx.xxx.xxx.xxx is listed at work.drbl.example.net"
The email provider is Aruba, from other networks it works and the customer doesn't have a mail server of his own.
Using the whatismyipaddress.com's blacklist-check tool https://whatismyipaddress.com/blacklist-check I've seen that the public ip of the network (220.127.116.11) is in the blacklists of dnsbl.justspam.org, dnsbl.sorbs.net and dnsbl.spfbl.net.
The problem is that to get delisted from dnsbl.justspam.org we must send an email from that ip address, but we can't, and if I use another provider than I get: "IP will not be removed because of a wrong Sender-IP. You have to send the removalrequest from the IP you would like to delist! This mail was comming from EUR02-HE1-obe.outbound.protection.outlook.com (mail-eopbgr10054.outbound.protection.outlook.com [18.104.22.168]) by removalsystem with ESMTPS id CC41E792F87 for <[email protected]>; Wed, 6 Feb 2019 15:40:35 +0100 (CET)." because is the mail comes from microsoft servers.
From dnsbl.spfbl.net instead they require an email of the customer's internet provider or to pay to use another.
Also I don't know how they ended up in these blacklists, maybe a spammer virus?
how can I solve this?
Post your questions about DNS based blacklists, what they are, listing status, and removal help.
3 posts • Page 1 of 1
- Forum Administrator
- Posts: 2573
- Joined: Tue Mar 02, 2010 5:41 pm
- Location: 127.0.0.1 | ::1
I'm unclear, are you running your own mail server or using an email service provider?
the customer is using an email service provider (Aruba) and doesn't have a mail server of his own