Am 15.12.23 um 14:49 schrieb L. Mark Stone via mailop:
We too are seeing high volumes of such email.
Historically, we have avoided deploying greylisting*, but are curious if
greylisting would block these emails? Could anyone who is doing greylisting
comment on whether these garbage emails are being resent?
Greylisting is generally ineffective against spam sent through a regular
e-mail infrastructure. It only helps when the sending software is either
set up to avoid retries or the sending IP is only used for a very short
interval.
Spam sent via accounts on freemailers is generally hard to reject
without resorting to content filtering. In some cases (when accurate
Received-lines are present) you may be able to filter based on header
information, but some providers (such as Google) hide this information,
presumably to protect the privacy of their users.
Cheers,
Hans-Martin
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