I am having a problem with pop3 mail retrieval of larger emails. Here is what is going on. I am using telnet to connect into my exchange server. I can connect into the server fine from both inside and outside my network.
If I am INSIDE my network and I telnet into my exchange server, I have no problems. I can connect, log in, LIST 1 which will show me the size and then I can RETR 1the email messages fine.
However, if I am OUTSIDE my network I have problems. I can connect via TELNET / POP3 and log in fine. I can LIST 1 fine. However, when I attempt to RETR 1 an email, I get the following error:
“-ERR Message number 1 is too large”
I will only get this error if the email is larger than roughly 15 mb or so up to my global limit. I can RETR them fine inside my network, but I get the error outside my network. Smaller emails go through and RETR fine inside and outside.
Here are a few tidbits of information that may be important:
1. Inside exchange I have my “Sending Message Size” globally set to 30 MB. Receiving and Recipient limits set to “No Limit”
2. There are no server-based limitations set inside exchange that I see. We are using Global settings only.
3. This problem affects all exchange servers in my environment regardless of location.
4. All offices are using the same ISP
5. All offices are running the same Cisco Firewall / ASA configuration. However I see nothing that would be blocking POP of a specific size.
6. The email itself delivers outside my network fine via SMTP as long as it is below the 30mb global limit. However I need to be able to grab them via telnet / pop3 for Journaling. This is what fails on large emails.
My guess is that this is an Exchange setting I am missing. Otherwise it’s a Firewall issue or a limitation with my ISP.
Has anyone encountered this problem before? Is there a setting somewhere that I may be missing?