SMTP / RFC |
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Allan 
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 Topic: SMTP / RFCPosted: 14 October 2003 at 8:27am |
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I know that different vendors look different on the RFC for SMTP - but: One of my customers is rejected by SpamfilterISP with this error: >>NOOP When receiving direct on my SMTP server, there's no problem.... Any suggestions ? / llan |
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Desperado
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Joined: 27 January 2005 Location: United States Status: Offline Points: 1143 |
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Posted: 14 October 2003 at 12:03pm |
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Allan, What SMTP server agent gave that silly response? Dan S.
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LogSat
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Joined: 25 January 2005 Location: United States Status: Offline Points: 4106 |
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Posted: 15 October 2003 at 12:18am |
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Actually the "Polite people say HELO" comes from SpamFilter ISP... :-) What really matters is the numeric 501 code which is what machines will look at, the description is for the humans... Roberto F.
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LogSat
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Joined: 25 January 2005 Location: United States Status: Offline Points: 4106 |
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Posted: 15 October 2003 at 12:29am |
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Alan, The problem is that the remote server is not issuing the HELO (or the EHLO) command after connecting to identify itself. The RFC does say that clients "should" use the HELO command, rather than "must" use. However since they are not identifying themselves SpamFilter rejects further commands until they issue the HELO. Furthemore, the remote server is not following the RFC "recommended" guidelines, so that is one more reason to assume it's spam. This option is currently not configurable. We may add an option to disable it in future versions, depending on the volume of requests. Roberto F. |
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Desperado
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Posted: 15 October 2003 at 12:18pm |
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The "Polite People Say Helo" is from the Spam Filter? .... I have never seen that one. Under what conditions?
Dan S.
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LogSat
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Joined: 25 January 2005 Location: United States Status: Offline Points: 4106 |
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Posted: 15 October 2003 at 2:36pm |
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Per RFC, remote clients "should" send either the EHLO or the EHLO commands right after the SMTP server sends the welcome banner. In the HELO command they are to identify themselves with the machine name, ex: HELO mailgate.logsat.com After that is done, they can go on with the MAIL FROM and RCPT TO commands. While the RFC says that this is how things "should" be done, and not "must" be done, SpamFilter requires the HELO command since all legitimate mail servers should follow the RFC. It is a product to fight spam, so it does what it can to ensure mail comes froma legitimate source. If a remote machines tries to issue a MAIL FROM command before sending the HELO, that is when the error occurs. Roberto F. |
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eric
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Posted: 15 October 2003 at 4:33pm |
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if one cannot telnet to his logsat server and issue the commands by hand,
you better start learning that first before posting ... ehlo mail from: rcpt to: data . rfc822 might help too, 1912 also.
no offense, -eric- |
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