granite03
asked on
Unble to send via IMAP
Hi,
We currently have an Exchange 2003 server and have a few users on MAC using Windows Mail with their accounts setup as IMAP accounts.
This was working fine but had an issue where someone used the server as a relay and was blocked by our antispam provider - Messagelabs. We then locked down the server to allow just the messagelabs IP addresses on the server.
How ever I am now not able to send emails via IMAP but I can receive emails. This is the same on Outlook too so its not just a MAC issue.
I have a user account set up on my Outlook and get the following send\receive error - Sending reported error (0x800CCC0F) : The connection to the server was interrupted. If this problem continues, contact your server administrator or internet service provider.
The firewall has the IMAP port open as I am able to receive just not send.
Is there anything I need to set up on exchange to be able to send using IMAP and not leave the server open for replay from unauthenticated users?
Thanks
We currently have an Exchange 2003 server and have a few users on MAC using Windows Mail with their accounts setup as IMAP accounts.
This was working fine but had an issue where someone used the server as a relay and was blocked by our antispam provider - Messagelabs. We then locked down the server to allow just the messagelabs IP addresses on the server.
How ever I am now not able to send emails via IMAP but I can receive emails. This is the same on Outlook too so its not just a MAC issue.
I have a user account set up on my Outlook and get the following send\receive error - Sending reported error (0x800CCC0F) : The connection to the server was interrupted. If this problem continues, contact your server administrator or internet service provider.
The firewall has the IMAP port open as I am able to receive just not send.
Is there anything I need to set up on exchange to be able to send using IMAP and not leave the server open for replay from unauthenticated users?
Thanks
ASKER
Thanks Simon,
I know how IMAP and SMTP work, it just came out wrong in my description :)
I have added my external IP address to the IP list along with the Messagelabs IPs and also allowed my user account to authenticate although all authenticated users are set to be able to send anyway but I am still unable to send.
They are going to be moving to O365 soon but until then I need to get them working again.
Thanks
Is there anything else I can check.
I know how IMAP and SMTP work, it just came out wrong in my description :)
I have added my external IP address to the IP list along with the Messagelabs IPs and also allowed my user account to authenticate although all authenticated users are set to be able to send anyway but I am still unable to send.
They are going to be moving to O365 soon but until then I need to get them working again.
Thanks
Is there anything else I can check.
ASKER
Sorry also forgot to mention I have this issue even when sending emails when users are in the office on the same network as the exchange server.
Thanks
Thanks
Is the client setup to authentication?
That has to be specific credentials, not "same as incoming" or something like that.
For SMTP the format is usually domain\username and then the password.
Simon.
That has to be specific credentials, not "same as incoming" or something like that.
For SMTP the format is usually domain\username and then the password.
Simon.
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ASKER
Hi,
Ok I have finally had a chance to work on this again.
I am not able to carryout a successful test of the account settings from my machine outside the network.
That is about as far as it gets, when I try to send an email from the imap account to my email address I get a undeliverable with the error below:
Your message did not reach some or all of the intended recipients.
Subject: RE: Test
Sent: 09/06/2015 16:06
The following recipient(s) cannot be reached:
My name on 09/06/2015 16:06
Server error: '550 5.7.1 Unable to relay for my external email address'
Thanks
Ok I have finally had a chance to work on this again.
I am not able to carryout a successful test of the account settings from my machine outside the network.
That is about as far as it gets, when I try to send an email from the imap account to my email address I get a undeliverable with the error below:
Your message did not reach some or all of the intended recipients.
Subject: RE: Test
Sent: 09/06/2015 16:06
The following recipient(s) cannot be reached:
My name on 09/06/2015 16:06
Server error: '550 5.7.1 Unable to relay for my external email address'
Thanks
ASKER
sorry I meant:
I am now able to carryout a successful test of the account settings from my machine outside the network.
I am now able to carryout a successful test of the account settings from my machine outside the network.
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IMAP is a protocol for reading email on the server, has nothing to do with delivery.
The problem is that you have locked down the SMTP server to the Message Labs IP range.
You have two options.
1. Change the IP range to include the addresses of the MAC clients.
2. Adjust the settings to allow relaying. Then configure the users who need to relay - specifically excluding the administrator account. Then in the Mac clients, configure them to authenticate when sending.
Obviously the best option would be to upgrade to a more recent version of Exchange, which will allow the Mac clients to connect via EWS.
Simon.