Date: Sat, 27 Jan 2007 13:50:26 -0200 From: JoaoBR <joao@matik.com.br> To: Roland Smith <rsmith@xs4all.nl> Cc: freebsd-stable@freebsd.org Subject: Re: Loosing spam fight Message-ID: <200701271350.26787.joao@matik.com.br> In-Reply-To: <20070127153953.GC96846@slackbox.xs4all.nl> References: <8a20e5000701240903q35b89e14k1ab977df62411784@mail.gmail.com> <200701271304.29216.joao@matik.com.br> <20070127153953.GC96846@slackbox.xs4all.nl>
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On Saturday 27 January 2007 13:39, Roland Smith wrote: > On Sat, Jan 27, 2007 at 01:04:28PM -0200, JoaoBR wrote: > > > Greylisting is a decent idea, but it seems to me that it's just anoth= er > > > tool in the ongoing arms race against spammers. It may work for a > > > while, but eventually they'll catch on and it will only cause > > > unnecessary delays for legitimate mail. > > > > finally some cares about the users here, that is a really important > > point, how do you justify that your client get the email he is waiting > > for an hour later? Probably he looks then for a better service > > provider ... > > The standard requires a retry time of at least 30 minutes: > http://tools.ietf.org/html/rfc2821#section-4.5.3 > > But most open-source MTA's will try to resend after around 15 minutes: > http://en.wikipedia.org/wiki/Greylisting > > Note that the SMTP protocol does not guarantee delivery within a certain > timeframe. > I guess most servers do retry after 1-4 hours > There are timeouts of several minutes for each of the SMTP > commands. This means that a full SMTP conversation can last at least 1/2 > hour, from one server to another. yes, therefore it does not make sense retrying after 10 or even 31 minutes > > In short, an extra hour transit time is not a fault or bad service as > far as SMTP is concerned. that is certainly a technical and political excuse which nobody want to he= ar=20 for getting email late, because the common understanding is getting an emai= l=20 on earth within some minutes =2D-=20 Jo=E3o A mensagem foi scaneada pelo sistema de e-mail e pode ser considerada segura. Service fornecido pelo Datacenter Matik https://datacenter.matik.com.br
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