Peter Davies wrote:
I know I'm not going to explain this right because I'm still fuzzy on some of the more obscure Internet protocols, but I remember having problems with mail delays (I run qmail) and it turned out to have something to do with IDENT... I don't run identd and the server trying to connect to me required it, causing a huge delay. In my case, I changed my firewall to return TCP RST for port 113 and the problem went away. However, it's my understanding that some servers will not only cause a delay but refuse a connection if it can't ident.I have recently noticed that email leaving my (otherwise very succesful) courier server (0.38.0) destined for <anyone>@pacbell.net sustains a "Connection timed out" and the message is deferred for a later delivery attempt. These attempts occur and some hours later the sender receives the bad news.
It's a long shot, but better than nothing :) see if you're running identd on your other servers but not running it on your courier server. If so, this may be one explanation for why they can connect and your courier server can't.
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