Hi What is wrong with server settings which causes my IP to be blacklisted. How to remove server from blacklist? Any idea? Due to this problem, I always get rejected emails from Google such as Mail Delivery System RBL: 550 Return Path RPBL Listed - sender_score" (in reply to RCPT TO command)
Blacklisting can happen for all kinds of reasons. - You haven't created an open relay? - All sent mail is dkim signed? - IP your host uses to send mail from has a rDNS record corresponding it's hostname (and certificate)? - Sending domains have valid SPF, DKIM and DMARC records in their DNS? Also sender_score can be based on a whole IP-block/subnet and not only your IP. Especially when using a VPS. Removal from a blacklists often takes a lot of patience. Or money if you want to speed things up.
A low reputation at Senderscore/Validity can result from not sending enough "good" emails to the major providers. Similarly, a low volume of emails may lead to a slow improvement in reputation. Usually it takes time to build up a good reputation, especially as said, if you have a low volume mail host. Also make sure that the helo name and reverse DNS record (PTR) do match, apart from remkoh's suggestions which I concur.
@johnymas, coincidentally, one of my mailservers is blacklisted on the "Sender Score Framework" and its "Return Path Blocklist" since Dec 14, too. It's that server's first blacklisting for many years, and I have no idea why, either. I can reach Google mail accounts without problems, though. They do have a removal page for that blacklist, by the way, which I just tried; they promise to tell you what the cause for the listing was. (That said, the page is showing me a 'please wait' sign for two minutes or so already.) Edit: Turns out the blacklist warning is already outdated; the removal page returns "You're Clear! That IP address is not currently listed in any Return Path-hosted blocklist"...
The removal page no longer works. There are two problems for me: The first one appears through Gmail when an email is rejected due to error: 550-"JunkMail rejected - 46636 is in an RBL: 550 Return Path RPBL Listed - sender_score" (in reply to RCPT TO command) The second one appears when the email through Outlook has been sent to extension .de email error: host mx-ha03.web.de[.....] refused to talk to me: 554-web.de (mxweb006) Nemesis ESMTP Service not available 554-No SMTP service 554-Bad DNS PTR resource record. explanation from web.de 554 Nemesis ESMTP Service not available No SMTP service Bad DNS PTR resource record.
Okay, as I already mentioned it, the reason why your mails are pretty likely blocked is the bad/missing reverse DNS record (PTR). You need to fix this in order to improve your mail deliverability. The PTR record can be set up at you server hoster. Also make sure that the PTR is aligned with the helo name which you can find in your server's postfix config (main.cf).
you just provide the correct fqdn.. eg if your mailserver name is mail.mydomain.com, then that is what you provide as the reverse dns for that servers public ip. unless you are directly responsible for the public ip's assigned to you then you may not be able to configure it yourself.. you may just have to let your hosting provider know what fqdn you want to use, and what ip you want to use it on, and ask them to configure it for you.. some of them will let you configure it yourself through their own control panel/console. it's going to be different for every hosting provider, so we can't really provide step-by-step instructions on how to do this.
