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rephrase greylisting section in pmg-intro

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and mention that the netmask for greylisting is configurable

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
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Stoiko Ivanov 2020-04-21 12:43:31 +02:00 committed by Thomas Lamprecht
parent d9aff9ab35
commit a446f8be90
1 changed files with 12 additions and 9 deletions
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21
pmg-intro.adoc
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@ -87,16 +87,19 @@ in message bodies.
Greylisting::
Greylisting an email from a sender your system does not recognize,
means, that it will be temporarily rejected. Since temporary failures
are built into the RFC specifications for mail delivery, a legitimate
server will try to resend the email later on. This is an effective
method because spammers do not queue and reattempt mail delivery as is
normal for a regular Mail Transport Agent.
Greylisting an email means, that it will be temporarily rejected. Since
temporary failures are part of the the RFC specifications for mail delivery, a
legitimate server will try to resend the email later on. Spammers on the other
hand, do not queue and reattempt mail delivery. A greylisted email never
reaches your mail server and thus your mail server will not send useless "Non
Delivery Reports" to spammers. Additionally greylisted mail is not analyzed
by the antivirus and spamdetector engines, which saves resources. Greylisting
can reduce e-mail traffic up to 50%.
+
Greylisting can reduce e-mail traffic up to 50%. A greylisted email
never reaches your mail server and thus your mail server will not send
useless "Non Delivery Reports" to spammers.
A mail is greylisted if it is the first mail from a sender to a receiver
coming from a particular IP network. You can configure which IP addresses
belong to the same network, by setting an appropriate netmask for greylisting.
SMTP Protocol Tests::