The option is interesting, do you have an example?

I tried to use it but it didn’t work for me.

smtpd_recipient_restrictions =
    check_recipient_mx_access cidr:/etc/postfix/recipient_mx_access.cidr

52.164.206.56 reject

Regards,

El 31/5/22 a las 16:00, Matus UHLAR - fantomas escribió:
On 31.05.22 12:55, SysAdmin EM wrote:
I am checking the mail queue of my postfix server and I am seeing errors in writing mail accounts, which refer to real domains of free mail providers
such as hotmail, gmail, yahoo.

BC2CC607AF   881286 Tue May 31 05:19:53  webchec...@kiusys.com
              (connect to hotmaul.com[54.159.98.68]:25: Connection timed
out)
                                        tc_gus...@hotmaul.com

BAF5D60E06     3071 Fri May 27 03:32:45  r...@kiusys.com
            (connect to hormail.com[104.215.95.187]:25: Connection timed
out)
                                        negritaa...@hormail.com

Any chance of blocking the MX of a recipient? Reading the documentation I
found the parameter "check_sender_mx_access" but I think it refers to a
sender and not a recipient.

there's also check_recipient_mx_access, I use few of them for this kind of abusers.

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