cannot send mail mail after changing spam filter from a third party to an internal firewall

Everything was working fine until I disconnected the third part spam filter.  The send connector was using the third party spam filter so I changed it to use the DNS from the server in Organization\hub transport\sendconnectors\network tab.

This worked but not all email were sending.  I called my ISP to setup reverse DNS lookup yesterday.  Now they cannot send any emails out.  Is there another setting somewhere on EMC that I need to adjust?
Computer HelperWindows Server AdminAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Marwan OsmanCommented:
0
arnoldCommented:
Without knowing what your errors are it is difficult to suggest a course of action.
1) check the log of outgoing connections on your mail server to see what it is getting/recording when attempting to connect put.
2) double check the outgoing configuration to make sure you are not forwarding all emails through the third party who've since disabled your ability to send through the,.
3) if your view of the logs in step 1 above, points to the new filter implementation, you would then need to check it to see what might be going in there.

Continue the trace up the chain, you are limited by what you control, so once you determine the block is external to you, I.e, your ISP is blocking your outgoing connections on port 25 to any destination except when the destination is the ISps mail servers.
0
Computer HelperWindows Server AdminAuthor Commented:
Looking at the ques I am seeing this error
451-4.4.0 Primary target IP address responded with "554-sudomin.domain.com451 4.4.0 554 Your access to this mail system has been rejected due to the sending MTA's poor reputation.  If you believe that this failure is in error, please contact the intende.

Another error is
451 4.4.0 Primary target email responded with 421.4.2.1 Unable to connect."  Attempted failover to an alternate host, but that did not succeed.  Either there are no alternate hosts or delivery failed to the alternate hosts.
0
Determine the Perfect Price for Your IT Services

Do you wonder if your IT business is truly profitable or if you should raise your prices? Learn how to calculate your overhead burden with our free interactive tool and use it to determine the right price for your IT services. Download your free eBook now!

Zacharia KurianAdministrator- Data Center & NetworkCommented:
Everything was working fine until I disconnected the third part spam filter

Did you update your MX records with your domain registrar?

zac.
0
Computer HelperWindows Server AdminAuthor Commented:
Yes I updated mx records and setup reverse dns with ISP.  I have discovered that some mail is getting in and out.  only a handful is not.
0
Zacharia KurianAdministrator- Data Center & NetworkCommented:
I believe those changes takes some time to get reflected over the internet. you can monitor if the change is taken place completely by doing an nslookup against your ISP's DNS server.

Zac.
0
arnoldCommented:
Your IP is not liked by the party to whom you are sending.
Are these errors coming from the same destination server, check whether your mail server is configured to send messages through a specific outgoing server?

Check with your ISP on whether they provide access to their mail server and whether. You want to send directly or through your ISPs server.

There are several blacklist checkers, see if your IP is listed. Though the message above , might be coming from your own spam appliance.  Check its logs to make sure that your own setup is what is blocking your outgoing mail.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Computer HelperWindows Server AdminAuthor Commented:
Blacklisted by BARRACUDA
Blacklisted by SORBS SPAM
0
Computer HelperWindows Server AdminAuthor Commented:
How do I fix that?
0
arnoldCommented:
barracuda, is your SPAM filter?
SORBS has their own interface to request removal or it has a time when they remove.

Make sure your email server is not an open relay as that is the surest way you will wind up on blacklist lists.
If you have a web site through which comments/emails are generated make sure those interfaces can not be used to send email out outside your defined destinations. i.e. can not be hijacked.
0
Computer HelperWindows Server AdminAuthor Commented:
Turned out that the Domain IP was blacklisted by two spam filter companies because I did not do a reverse DNS with my ISP before the original spam filter was shut off.  I went to both blacklistees and filled out the forms to have the blacklisted IP removed.  this took about 2 hours to complete.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.