Kristian Duus Østergaard writes:
Hi,My smtp server is currently using identlookup and I think it is one reason thatI don't receive a ton of Spam.Unfortunately some of my users receive mails from a domain that has a very short timeout and drops identlookups at the firewall, instead of rejecting them. This results in no mails coming through to my users from the domain in question andme getting asked how many other domains does this happen from. My own
The success or failure of ident lookup has no effect on whether the mail from the sender is accepted, or not. Has no impact, whatsoever.
The only thing that ident lookup does is record some additional data in mail headers.
And, with each passing here, the value of ident lookups gets smaller, and smaller. identd is only to be found on multiuser servers, which haven't been exactly popular, in a long, long time.
As others have stated, Courier will timeout on its ident query after 30 seconds. Legitimate mail servers will wait several minutes before timing out.
There's also some confusion here regarding when ident lookup matters.Courier makes an ident query when receiving mail. And Courier will timeout after 30 seconds.
When sending mail, Courier has no control over whether the remote mail server issues its own ident query, Courier will wait 5 minutes for the remote server's initial response, and that is configurable wth the esmtptimeouthelo config setting.
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