• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 321
  • Last Modified:

AN SMTP protocol error occured

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
IT_Pax
Asked:
IT_Pax
  • 2
1 Solution
 
Simon Butler (Sembee)ConsultantCommented:
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
 
IT_PaxAuthor Commented:
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
 
IT_PaxAuthor Commented:
Quick to respond. Gave the best possible answer with the information provided.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Making Bulk Changes to Active Directory

Watch this video to see how easy it is to make mass changes to Active Directory from an external text file without using complicated scripts.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now