?
Solved

AN SMTP protocol error occured

Posted on 2013-05-10
3
Medium Priority
?
312 Views
Last Modified: 2013-05-15
Server Type: Server 2003 STD SP2
Exchange 2003
We Use ZoneEdit  

Recently we were attacked by hacked mail servers. we got blacklisted at 3 different places tier 1. it has been about 2 days that we are no longer listed and everything has been resumed back to normal.

Except that some messages from some domain are stuck in my queue and are stuck on retry
highlighting  that folder allows me to see a message that states smtp protocol error

another folder states connection was dropped by remote host

no changes where made to the configurations on the server

Most emails are being sent with out a problem.
0
Comment
Question by:IT_Pax
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 39155153
The fact that you are are off the blacklists doesn't mean you will get email delivered to all places. A lot of systems will cache blacklist list results. Therefore it can be some time before email can be delivered reliably. If you must send email to those domains, setup an SMTP Connector with a smart host, using your ISPs SMTP server as the smart host to get the email out.

Simon.
0
 

Accepted Solution

by:
IT_Pax earned 0 total points
ID: 39156487
Thanks Simon.

I was able to send out to those domains by fixing a reverse DNS mismatch issue.

However, I will take your advice should this issue arise again in the future.

Cheers
0
 

Author Closing Comment

by:IT_Pax
ID: 39167418
Quick to respond. Gave the best possible answer with the information provided.
0

Featured Post

Ransomware-A Revenue Bonanza for Service Providers

Ransomware – malware that gets on your customers’ computers, encrypts their data, and extorts a hefty ransom for the decryption keys – is a surging new threat.  The purpose of this eBook is to educate the reader about ransomware attacks.

Question has a verified solution.

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

After hours on line I found a solution which pointed to the inherited Active Directory permissions . You have to give/allow permissions to the "Exchange trusted subsystem" for the user in the Active Directory...
A couple of months ago we ran into an issue that necessitated re-creating our Edge Subscriptions. However, when we attempted to execute the command: New-EdgeSubscription -filename C:\NewEdgeSub_01.xml we received an error indicating that the LDAP se…
In this video we show how to create an Accepted Domain in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Ac…
The video tutorial explains the basics of the Exchange server Database Availability groups. The components of this video include: 1. Automatic Failover 2. Failover Clustering 3. Active Manager
Suggested Courses
Course of the Month10 days, 11 hours left to enroll

764 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