Exchange External mail not flowing
Hi, URGENT HELP NEEDED!
we have a client we look after at work that is having mail routing problems. Internal mail in fine, it is simply anything that is leaving the organisation or coming into the organisation.
I am pretty new to exchange and have been lumbered with this problem and am under pressure to get it fixed. below are the results of another engineers testing smtp port 25
[I]Testing inbound SMTP mail flow for domain 'administrator@DOMAIN.com.au'.
The Microsoft Connectivity Analyzer failed to test inbound SMTP mail flow.
Attempting to retrieve DNS MX records for domain 'DOMAIN.com.au'.
One or more MX records were successfully retrieved from DNS.
Testing Mail Exchanger mail.DOMAIN.com.au.
One or more SMTP tests failed for this Mail Exchanger.
Attempting to resolve the host name mail.DOMAIN.com.au in DNS.
The host name resolved successfully.
Testing TCP port 25 on host mail.DOMAIN.com.au to ensure it's listening and open.
The port was opened successfully.
Analyzing SMTP Capabilities for server mail.DOMAIN.com.au:25
SMTP Capabilities were analyzed successfuly.
Attempting to send a test email message to administrator@DOMAIN.com.au using MX mail.DOMAIN.com.au.
Delivery of the test email message failed.
The server returned status code -1 - The operation has timed out.
Message: The operation has timed out.
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTe st.PerformTestReally
There have been multiple tests run, some email gets into the exchange server, but can take several hours. I have had an email from an engineer that is now on annual leave to tell me what he has tried to do, some of which is:
- Disable Antivirus services
- Enable POP3 and IMAP4 services
- Restarted MS Exchange AD topology and Information Store services
- Reboot server
- Disable Windows firewall private and Public profile
- Created new recipient connector
- Created new SNMP connector for port 587
- Changed FQDN of all recipient connectors From remote.DOMAIN.com.au to mail.DOMAIN.com.au and vice versa
- Changed remote server Ip addressed range to allow all connection for recipient connector
All have been tried and tested yet no joy. he suspects maybe MX hosting service provider issue where email gets delayed or dropped. but not sure where to go with this.
Any advise people?
thanks in advance!!