To block this type of spam I've increased the score of GB_HASHBL_BTC (Bitcoin rbl) rule. Giovanni
On 11/10/23 11:01, Mark London wrote:
Sendmail didn't introduce FEATURE(require_rdns) until 2007. I'm sure I've been using it longer than that. And by default it's not enabled. It doesn't totally block the "I RECOVERED YOU" spams. Occasional some come through with ip addresses that have valid reverse lookups. But the number getting blocked, is still huge. On 11/10/2023 4:48 AM, Reindl Harald (privat) wrote:Am 10.11.23 um 08:40 schrieb Mark London:Marc - You are correct. All the IP sources of this spam, don't a valid reverse lookup of the IP address, to an IP name. That will solve my problem. Thanks! - Markin other words your MTA is misconfigured https://www.postfix.org/postconf.5.html#reject_unknown_reverse_client_hostnameOn 11/9/2023 12:38 PM, Marc wrote:Do you at least verify the reverse lookup? That already stops a lot of such networks.
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