Questions tagged [blacklist-prevention]

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1answer
60 views

How do I get a site unblocked from corporate firewalls

I have a pretty new site, nothing shady has ever happened with it, some of my friends have reported that they can't access said site at their company. How can I figure what lists I'm on and how to get ...
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0answers
384 views

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 ...
1
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0answers
367 views

Efficient way to prevent UDP port scan

I have a Ubuntu server, there are services public in some ports, include TCP and UDP, and trying to protect it against port scanner (TCP and UDP). The TCP scanner block is done by using "recent" ...
1
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1answer
310 views

Google Cloud App Engine hosted page title extractor returns 403 Forbidden in cases

I have a URL shortener/traffic analysis service hosted in a Google App Engine (GAE) project on Google Cloud (GC). When a URL is submitted for shortening, it performs a Python urllib2.urlopen to ...
3
votes
1answer
303 views

Server “shows signs of being infected” - how to resolve email blacklisting

I help manage 178.32.51.182 and noticed we were getting bounced emails because of several blacklists those are: CBL FABELSOURCES Spamhaus ZEN so I checked the first blacklist here: http://cbl....
0
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1answer
1k views

Exim Blacklist -> *domain doesn't work

I have a manual filter in the exim. It was done this way: In section: "CONFIG". I put: domainlist exim_blacklist lsearch;/etc/eximblacklist In Section: "PREROUTERS". I put: driver = redirect # RBL ...
1
vote
1answer
650 views

Google Apps with internally/customer hosted SMTP relay - (not using smtp-relay.gmail.com service)

We are using Google Apps for our email service, and send a bulk of around 15k emails a day from our internal relay server (its outbound only, no open-relay) to customers. Recently, we ended up ...
-4
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8answers
23k views

Remove blacklist from spamRATS

I have checked my IP in SpamRATS and the result is the following: Standards Compliance: Does IP Address resolve to a reverse hostname... Passed! Does IP Address comply with reverse hostname ...
1
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1answer
113 views

What is the best approach to handle email form abused by bots?

I just recently moved to a Dedicated Server hosting from a normal Reseller Hosting, and currently facing issue with email blacklisting. One of my clients has about 4 contact forms that automatically ...
3
votes
2answers
101 views

SMTP: Which IP should I monitor?

I use a relay server to deliver external mails. I use relay server's IP in SPF record. But I'm not sure about blacklist monitoring/checking. Should I check main server's IP or relay's IP?
-4
votes
1answer
417 views

Send thousands emails for newsletters [closed]

i have a huge list (5K emails) of email addresses, it's not spam , these are newsletter emails i have to send. I'm wondering , since i have to send these emails with my personal account (verified) ...
3
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2answers
823 views

Alternatives to avoid domain from being blacklisted

We outsource our web and email hosting to a web hosting company and occasionally I get complaints from our clients or internal staff that mail from our domain does not reach the intended recipient or ...
1
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5answers
2k views

Best Practices for Open Relay Email Server

I have a scenario where I need to setup postfix with no TLS, no SMTP authentication, and open relay allowing from only one remote IP address. Emails from this remote IP may have spoofed "from" address ...
2
votes
1answer
2k views

How can I change exim's DKIM and SPF for emails sent?

I've now spent 2 hours trying to figure out this issue and I am about to give up and go to bed. I've been having issues with Gmail rejecting emails from my VPS server because of false spam alerts (...
1
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3answers
3k views

How to go about deploying batches of 5,000 emails?

I have been warned that sending too many emails too quickly can trigger an internet email blacklist/spam filter. I have a list of approximately 5,000 customers that I want to send a newsletter to. I ...
1
vote
5answers
184 views

Mail server blacklists

Recently I've had a few clients on a server having issues with a blacklist. I've been googling for about an hour and am a little tired of it, but maybe someone here can help me. What do blacklists ...
1
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3answers
691 views

Log all outgoing mail from PHP on a Redhat box

The IP of one of our servers has been blacklisted and I would like to attempt to work out why. There are many Apache virtualhosts on the server so the logging would need to be split up by domain and ...
5
votes
3answers
565 views

Clean up an opt-in email address list

We have a client that has an email marketing list of about 50k contacts that have at some point opted in to their mailing list. They haven't used the list for a while and on their last campaign got a ...
3
votes
3answers
1k views

How do I prevent mail from my Exchange server from being blocked?

Recently one of our client machines was infected with a virus and I believe was spamming addresses in the user's contact list. Since then our server has been appearing on blacklists and it has been ...
2
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2answers
440 views

Guidelines for Mail Servers - How to Maximize Deliverability to Remote Inboxes

My non-profit association has an Exchange server and a ListManager server to handle announcements to our members (about 800 email addresses) and several low-traffic discussion listservs. On the ...
1
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2answers
487 views

SMTP Outbound-Only: More or less reputable?

I'm reconfiguring some mail architecture and wondering about this... For the purposes of avoiding blacklists and maintaining a good MX reputation, is it better to have: One public IP / SMTP server ...
4
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5answers
4k views

Why are email messages sent from my PHP application being treated as spam?

I have this funny thing. When I send an email out, to yahoo, gmail or hotmail users. If I include a link, it will treat as spam mail. But if i removed the link, it will become "inbox", not spam mail. ...
-1
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6answers
781 views

Mail server blacklisted

I have a mail server on x.x.x.x global IP. But it is blocked by SpamCop DNSbl spamcop dot net and CBL DNSbl cbl dot abuseat dot org .They inform that from my mail server lot of virus is generated. ....
4
votes
3answers
999 views

Customer's IP Listed on RBL - What steps do you use to prevent black listing?

Customer called saying their e-mail was bouncing from particular vendors. Investigated it and identified they were listed on more than one RBL/CBL. Restricted firewall to only allow traffic on port ...