How to configure Greylisting?

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    Thomas Mendorf (Edited )

    It would be great if greylisting could be configured to only match on the first three octets and not all four of an IPv4 address (similar for IPv6) - there are large enterprises out there running several MX hosts on same subnet that seem to share one queue. It seems to be pretty common to have their mails retried up to 8 to 12 times for delivery (each MX will try once) which results in delays of half a day. I was happy to hear that greylisting is possible with Plesk however I still prefer my old solution that is capable of allowing same subnet senders.

    Alternatively, a range value (-/+) of IP address "neighbours" could be helpful, if someone feels that 255 hosts will be too much to accept on the second try.

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    Ivan Postnikov

    @Thomas Mendorf

    Hi!

    Thank you for sharing the idea!
    Please, share it at Plesk User Voice.
    The top-ranked suggestions are likely to be included in the next versions of Plesk.

     

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    Unknown User

    It is a good idea to get rid of the "static" blacklist rule, many hosting centers use this word in rev dns.

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    b_p

    Could you perhaps clarify the term white/black domain patterns in your explanations? Does this refer to the domain names of the sending client or to the sender domain of the e-mail (i.e. the domain part of the sender address)?

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    Ivan Postnikov

    Hello @b_p,

    These are  the domain parts of the sender address

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    b_p

    Hello @Ivan Postnikov,

    just to clarify, also related to the Plesk documentation (https://docs.plesk.com/en-US/onyx/cli-linux/using-command-line-utilities/grey_listing-greylisting.63188/):

    - the options -whitelist / -blacklist refer to the sender address / domain while

    - the option -whitelist-domain / -blacklist-domain refer to the domain / host name of the sending client?

    The latter option is hopefully what I am looking for because there are some providers (e.g. 1&1 Ionos, https://www.ionos.de/hilfe/e-mail-office/company-name-postmaster/ip-adressen-der-company-name-mailserver/), who use multiple servers (different IP addresses but same host name) for outgoing e-mails. This creates the problem that often e-mails are not delivered when for each subsequent connection attempt a different address is used. Thus, I was looking for a solution where I can whitelist the hostname of the sending server. I assume that -whitelist-domain does this? Unblocking individual mail domains does not work well in this case since these providers host a multitude of domains...

     

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    Ivan Postnikov

    Hello @b_p,

    The option -whitelist-domain / -blacklist-domain allows you to add sender hostname to black/white list, for example, like in this article
    https://support.plesk.com/hc/en-us/articles/115003642894-Mail-from-domain-specified-in-the-whitelist-rejected-by-greylisting

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