mail writes:
Hi,
I have a somewhat strange issue. Tried with courier 0.44.2 and 0.45.4, running on RedHat 3.0 ES all patches installed, with the same results ...
My clients are either Mozilla Thunderbird 0.7.1 and Mozilla 1.6 configured for SSL connections (using 4 MBit cable connections).
Now, when I try to connect to the server, it takes at least 30 seconds before the connection is established ... WHY? There is NO load on the server side and I can't see anything in the log files ... it's just awfully slow?! If I disable SSL encryption, it will be lightning fast ...
Your cable Internet provider is acting like your nanny, and wants to change your diaper. Your cable Internet provider intercepts all of your attempts to connect to any external mail server on port 25, and redirects it to their own mail servers, so that an unencrypted mail connection never reaches your Courier server.
SMTP-over-SSL connection are not directly intercepted, and end up connecting to your Courier server, which issues an ident query back to your IP address.
Here, your cable Internet provider once again performs its duties as your nanny, and blocks all ident queries from reaching your client. The ident query times out after 30 seconds, and the SMTP connection proceeds.
Your cable company's mail servers do not issue ident queries, so that unencrypted connections are redirected to their mail servers, which respond immediately.
Solution: drop the cable connection and switch to real Internet access, where your provider does not screw around with your Internet connections, on a whim.
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