Solved

email being rejected

Posted on 2009-05-13
2
423 Views
Last Modified: 2013-11-30
Hello,

I'm having issues sending email to particular domains that are rejecting my email or just simply blocking it.  I searched to see if our ip address was blacklisted and found that it was with some dnsbl's.  We're not spamming at all and I've had to write letters to get our ip address removed.

Barracuda Central was one of the first to inform me of being blocked.  I was rejected by a recipient.  It was suggested that I block port 25 from within the network.  I  changed everyone's smtp port number to 587.

The IP address that is being blocked is being used by one of my servers.  I have a NAT configured and the private IP of the server is pointing to the public IP visa versa.  Each message that I've gotten from rejected email points to our public IP address.  

Can this be false alerts to dnsbl's?  I've had no problems up until a few days ago.  Nothing with our configurations has changed.  I have no rogue machines spamming email due to the fact that I've blocked port 25 internally.

I'm having issues sending email to certain domains.  One issue doesn't happen all the time; I have another issue of sending email to a domain that does not reject the message it just goes into cyber space.  I've called and talked to our email service provider and they state they need header information from the email, but the problem is I'm not getting rejected emails from this one particular incident.

Does anyone have a suggestion or a new direction to take to figure this issue out? It would be greatly appreciated.  In the mean time I'll be thinking and searching for an answer.

Thanks in advance,
0
Comment
Question by:lemastass
2 Comments
 
LVL 2

Accepted Solution

by:
ratan_koduru earned 500 total points
ID: 24382085
Do you mean to say that you blocked port 25 from all the machines and you still got blocked by some domains?

Did you check if that block was a result of earlier problems?

We had a similar problem some time back. When you get blocked the first time, they wait for around a month to un-block you. We blocked port 25 from all machines except the email server.

Ratan Koduru


0
 

Author Comment

by:lemastass
ID: 24403739
Yes I blocked port 25 from being used internally by all devices using my firewall.  At this moment I cannot send email to cox.net from our domain, but we can send email to every other domain.  I called Cox service and they stated that we're not blocked.  I called our email service provider and they stated that there's isn't a problem. The messages are hitting our email server and making its destination to Cox.  It all points back to Cox.  

I've also contacted all dnsbl's to request removal of our ip address.  I haven't heard back from any of them yet.
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Office 365 - Outlook 1 971
PHP  error check before trying to send emails 2 117
Excel Spreadsheet - Send email if certain value is selected. 14 97
domain name email 3 73
What is Usenet? There are many different opinions on exactly what Usenet is an isn't. Many opinions are incorrect simply out of ignorance. The Wikipedia listing about Usenet does a good job of explaining it, so instead of repeating it all here I wi…
Pop culture is prime bait for hackers seeking to infect user’s computers and mobile devices with malicious malware. Hackers know exactly what the latest trends are online and know how to use them to their advantage.
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

776 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question