Questions tagged [blacklist]

A blacklist is a basic access control mechanism that rejects elements included in the list.

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How to unblacklist an email at Microsoft/OutLook/hotmail

When trying to send email to clients who use Hotmail/Outlook/etc type email addresses, I get the following error: SMTP error from remote mail server after RCPT TO:some@email.com: 550 5.4.1 Recipient ...
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Exim4, it's a good idea to automatically populate local_sender_blacklist based on hard bounces?

GMX in it's sender best practice says: The sender must immediately remove email addresses from their dispatch lists if hard bounces occur I'm using exim4, and with eximstats you can obtain a list of ...
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Can't SSH to Sever, IP is Blocked [closed]

I am running VPS on digital ocean droplet with CentOS CWP. I have hosted single wordpress website on that server. Whenever, I try to connect to SSH server, the request times out because my IP is ...
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Blocking everything from sending mail except postfix

How could I use iptables to block anything except the Postfix user from sending mail? It would be useful in case a web app such as wordpress got infected with malware and started sending spam. We ...
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1answer
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Apache 2.2 IP address blacklist

I wanted to blacklist on the fly some IP address. I'm updating the main httpd.conf but i wanted to add some IPs on the fly, without using .htaccess (neither the heavy fail2ban). So, i creating a list ...
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Finding emails filtered by a blacklist

my postfix is configured to forward emails from a domain to an icloud.com email. Unfortunately, my server landed in one of the blacklists that icloud is using and now my client is not receiving his ...
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1answer
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Google blacklist removal

One of the email accounts on my Debian server has been compromised (too weak password set by a client) and it was sending countless spam messages over three days. Once I've found out that out (, I'...
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273 views

Reverse DNS Not Working on some Email servers

We host our email on an internal server. Recently we have started getting bouce backs from various other servers. Most seem to have the following error: Reason: Remote SMTP Server Returned: 550 ...
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1answer
636 views

How do I tell Amazon SES their IP addresses are blacklisted?

Is there an official way to tell Amazon SES about blacklisting, and ask them to talk to the other company involved? I have had emails disappear this week and last week (Ironport doesn't even send ...
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1answer
2k views

What is meant by '550 Relay not Permitted' when it comes to emails?

For the past few months, I have been emailing a company with no problems. They have been able to receive my emails and they have been responding. A few days ago, they dropped me an email where my ...
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1answer
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Fixing a server that has been listed an Email Spam [duplicate]

Full Disclosure: Setup of email servers is something fairly new to me, so go easy on me :) Recently users reported that they were not receiving emails from my site. The site runs a vbulletin forum so ...
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Active Directory password change: Re-Allow current password?

My question is that simple: Can I configure an active directory in a way that when a user wants/needs to change his password, his current one isn't forbidden (if it's in compliance with the current ...
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1answer
549 views

iptables blacklist empty User-Agent sip tcpdump

I scan using tcpdump for user-agents that hit my phone server. I get interesting results. i add them to a list that protects alot of my servers out there. This works good. The problem is I get ...
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394 views

Postfix sender blacklist

I'm running my own mail server (Ubuntu, Postfix, MySQL, Dovecot, Amavis, SpamAssassin, ...) since years for my family's mailboxes (5 mailboxes in total). I always try to improve my antispam filters. ...
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How do I get my server off the ivmSIP blacklist?

On March 22nd I was notified by MX Toolbox that my server ip was blacklisted by ivmSIP and Hostkarma Black. I was aware of an attack some of our clients sites had suffered towards the end of January ...
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How does Bind9 work as a private DNS, to get past URIBL Query Refused?

If queries to URIBL are blocked because URIBL "detects" that your DNS query is using a dns resolver ip address that has already made too many queries and exceeded the limit... How does using a LOCAL ...
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1answer
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Rejected - TRUSTmanager (in reply to MAIL FROM command)

After changing an IP address of email server (Postfix stack) I've found host that denies email message with: hostname postfix/smtp[38212]: 1AF542406D0: to=<user.name@domain.tld>, relay=xxx.xxx....
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Why the ip can't be banned with postfix blacklist?

vim /etc/postfix/main.cf smtpd_recipient_restrictions = check_sender_access hash:/etc/postfix/access Add some ips in /etc/postfix/access vim /etc/postfix/access 86.111.171.141 REJECT 191.96.249....
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How configure Postfix to check external blacklists?

How configure Postfix to block spam messages using external blacklists, like SPAMHAUS and BARRACUDA? Here my main.cf virtual_alias_domains = virtual_alias_maps = proxy:mysql:/etc/postfix/mysql-...
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1answer
1k views

Remove AS that's falsely associated with our IP from email block list

When I try to send email from our email server to hotmail or outlook.com I get 550 5.7.1 Unfortunately, messages from [216.x.x.x] weren't sent. Please contact your Internet service provider since ...
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2answers
382 views

Server IP blacklisted by RBL's

I'm using office365 mail for my domain Eg. "apples.com". The IP address is blacklisted, i think only the Microsoft support can de-list it from RBL's. Also after looking at the email header it looks ...
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1answer
3k views

Blocking clients by IP using dynamic list in NGINX

I have a service using nginx as a frontend server. Some bots constantly bruteforcing /login page and it is sufficiently drops my server productivity. What I want to do is to count amount of login ...
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1answer
837 views

postfix not blocking blacklisted IP

I have a postfix/dovecot server running inside a docker container, and I would like to block some IP addresses from connecting to my SMTP server. I have the following in /etc/postfix/main.cf: ...
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1answer
1k views

Google detect mail as spam, server is not on blacklists, got 550-5.7.1 likely unsolicited mail

about two weeks ago I had security breach, one mail account on server, caused outgoing spam, I got listed in on couple blacklists rbl. Problem was fixed, IP was removed from all black lists. I can't ...
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2answers
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How to block access to web-hosting servers?

Is there a way to block all web-hosting servers trying to access my server? There are a lot of hacked websites used to do damage to my server and only common thing is IP of agressor (many of IP's) is ...
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How to block an IP for a specific site on a server with multiple sites

There's something hitting a server I'm looking at a rapid rate and it's taking the site down. It's doing ... POST /index.php/api/v2_soap/ HTTP/1.1, host: dev.mysite.com I'd like to block all IPs to ...
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1answer
944 views

How can I remove my ip from the blacklist ivmSIP / 24?

I checked my server IP with this tool: http://www.mxtoolbox.com/SuperTool.aspx It has appeared in the ivmSIP / 24 list. What can I do to remove my IP from this list? I have SPF records set to allow ...
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1answer
700 views

How to allow only some IPs for the root of the website and all IPs for specific subset of URIs?

I have a website which is protected by Allow from IP filter but there is one specific subset of URLs which I would like to be open for everyone. dev.someweb.com should be available only from specific ...
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1answer
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BlackList and WhiteList with windows server 2012r2 in Domain?

I'm trying to create Blacklist and Whitelist which dissallow or allow users in my domain installing certain softwares, programs. I just create a GPO in Company A OU, didn't modify anything. When I ...
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2answers
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Why is my mail server blacklisted (graylisting failiure)?

My mail server was blacklisted. I fail to understand why. It was first greylisted and than it became blacklisted. Greylisting is a practice of temporary rejecting mail coming from one mail server to ...
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Blacklisted by Sorbs only when my MUA in a specific network

I have: 2 networks A and B; 2 mail boxes abc@domain1.com and abc@domain2.com; destination xyz@gmail.com; a computer with MUA thunderbird. I'm in network A, send a mail from abc@domain1.com to xyz@...
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1answer
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552 user@domain is Black-Listed! in reply to Mail From command

For the last few days we are having some issues with few server we administrate. The remote servers are throwing the following error. 552 user@domain is Black-Listed! in reply to Mail From command ...
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1answer
154 views

How long DNS blacklist updates at Lotus Domino?

As I kown,for performance,Lotus Domino will get the DNS blacklist from the DNS blacklist sites and save it in memory. So,it is not real time? For example: 2016/08/30 09:37:46 SMTP Server: ...
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1answer
1k views

fortimail antispam has blacklisted the internal exchange mail server address

i have an exchange server for which i wanted to redirect outbound messages throught a fortimail antispam box. i created a new send connector for a test domain and used the ip of the antispam as the ...
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2answers
1k views

Blacklisted client: why did Postfix not reject this email?

Answer The best answer was on the postfix-users mailing list and it is summarized here for the benefit of serverfault's users. I had forgotten soft_bounce = yes. Always switch it back to no after ...
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709 views

SMTP Mail delivery failed for URIBL query refused

I'm experiencing some trouble with a single recipient because his mail server refuse my email. This is the error reply: SMTP error from remote mail server after RCPT TO:<xxxx@xxx.xxx>: 554 5.7....
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2answers
946 views

Spamassassin: Bypass /etc/resolv.conf DNS for querying DNSBL?

Question Is there a way to let spamassassin bypass my linux system's dns servers to query DNSBLs? Background Info When my Server receives email, it is checked by spamassassin. One of this checks ...
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723 views

Business partner's IP in China is blacklisted so cannot email me

A business associate of ours out in China who we have been working with for over 5 years is now struggling to email us in the UK.. he is receiving the following error: Your message to .... was ...
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2answers
62 views

External Relay Server when server is on Blacklist

I have a Server with Cpanel , that is in a network with Blacklist (no way to change the Ip , all dirty ) , what i want to do , is install another server in another network that all emails sended can ...
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1answer
53 views

Mail getting blocked as abuse, error 500 [duplicate]

we just moved our domain ( daytonaparts.com ) to a new service provider ( ait.net ) and since we went live we have had our emails rejected by AT&T and Microsoft ( Hotmail, MSN, Live.com ) with an ...
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1answer
2k views

Postfix Localhost Server Sending Spam to Itself

I have an iRedMail server that runs Postfix and am trying to determine the source of its spam problem. I have since changed the MX records on the domain for the address receiving spam and the good ...
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2answers
686 views

How to whitelist an ip range blacklisted by Spamcop

Our testing team uses email addresses from a domain which is different from the actual site domain. For example, our site is www.abc.com and email addresses are belongs to user_x@xyz.com. www.abc.com ...
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1answer
2k views

Postfix reject_rbl_client Blacklists Not Working

I have a mail server (iRedMail) that uses Postfix. I've been getting a lot of spam, so I modified the /etc/postfix/main.cf file and have the smtpd_recipient_restrictions set to this: ...
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1answer
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Exim server and blacklist for too much login attemps

This is the today exim reject log: 2016-01-07 13:48:44 login authenticator failed for (USER) [212.224.87.119]: 535 Incorrect authentication data (set_id=info@mydomain.com) 2016-01-07 15:32:09 login ...
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2answers
161 views

How do IPs end up on the spam blacklists [duplicate]

I don't know if this is the right place to ask this kind of question but here goes. I have 3 IPs on my server, which I'm running for shared hosting. The main shared IP gets blacklisted sometimes, ...
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1answer
29 views

Email forwarding issue

I have a website at classicalmusiccity.com. We have emails tied to that domain that forward to a gmail account. Everything has been fine and dandy until a couple days ago. No one can send an email to ...
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4answers
2k views

False IP blacklisting on CBL and Spamhaus ZEN

I've gone thru this: Spamhaus XBL keeps adding my IP I'm managing the server 23.239.30.81 on Ubuntu using Postfix. Since last 6 months or so I started forwarding all my: Cron Daemon logs Postfix ...
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1answer
226 views

Determining e-mail server blacklisting from log files

I have my self-hosted e-mail server. There is no current problem of being blacklisted but I want to be proactive about it and I want to start with the log files. There have been some entries in my ...
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1answer
725 views

Microsoft Exchange 2013 and Open Relay Prevention

I have set up a Exchange 2013 server on my Windows Domain network to receive and send mail both internally and externally. After a rejection by Google to receive email from my server (the reason was ...
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1answer
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how to specify a partial domain in blacklist with SpamAssassin

is there a way to specify a partial domain in the spamassassin blacklist? I get spam from something like abc@something1.something2.xyz but I also get junk from abc@something3.xyz. if I specify @.xyz ...