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1: Local exchange server connect to Proxmox Internal SMTP port: 26 for outgoing emails. 2: At /etc/postfix/invalidemail,i have such content and run postmap for /etc/postfix/invalidemail dsfcdsf@gmail.com REJECT No such user found on the system. sdsff@gmail.com REJECT No such user found on...

I am thinking a method to block all of such and make a list to whitelist some,if really good company without MX

As found some spammers use this method to sending spams. Most of case,the envelope from without MX is spams!

reject_unknown_reverse_client_hostname will block normal emails

I show you some example HELO=m13215.mail.163.com MAIL FROM=XXXXX@m13215.mail.163.com HELO=mail115-204.sinamail.sina.com.cn MAIL FROM=XXXX@mail115-204.sinamail.sina.com.cn

The spammer will use HELO that has A record,so reject_unknown_helo_hostname not working to block it

reject_unknown_sender_domain Will reject email if mail from domain has neither mx record nor a record,for some spammer,they will sending forged emails that has A record but no MX record,in that case,if the IP is clean,postfix is accepted by default. If there any way to direct block those without...

Another issue,if you have several domains there only 1-2 domains have result at tracking center,but you can see other domains Spam Quarantine without problem

It is just like EXCHANGE bug,at the moment,crash!

It looks like something problem with rsyslog service. rsyslogd[557]: [origin software="rsyslogd" swVersion="8.2102.0" x-pid="557" x-info="https://www.rsyslog.com"] exiting on signal 15. after service rsyslog restart,it have logs for new mails

See some error log: Jan 01 17:57:29 postfix pmg-smtp-filter[1137]: starting database maintenance Jan 01 17:57:29 postfix pmg-smtp-filter[1137]: end database maintenance (16 ms) Jan 01 17:57:30 postfix pmgproxy[25229]: Deep recursion on subroutine "HTML::Element::delete" at...

My last record at tracking center is: Dec 25 17:45:21

At least,all the users have the same issue,that is sure,it is a bug.

From 26,dec-2021 till now,all is missing

I have same issue too,seems it is a bug

I see some other also have tracking center empty issue,seems it is not caused by opendkim https://forum.proxmox.com/threads/tracking-center-empty-since-01-01-2022.102322/

yesterday,i run: apt-get install opendkim,opendkim-tools,and config master.cf as below: smtpd pass - - - - 98 smtpd -o content_filter=scan:127.0.0.1:10024 -o smtpd_discard_ehlo_keywords=silent-discard,dsn -o mynetworks=127.0.0.0/8 -o...

Thanks Stoiko Ivanov,i disable apparmor,then all works fine now

The clamav can never start,the error is as low. Version 7.0-8 Oct 22 20:51:48 postfix pmgdaemon[1133]: starting task UPID:postfix:00003619:000470B1:6172B3E4:srvstart:clamav-daemon:root@pam: Oct 22 20:51:48 postfix pmgdaemon[13849]: starting service clamav-daemon...

I mean to keep the Return-Path as MAIL FROM (Sender) when restore the email. As if using the administrator email,the final email client will have such info: XXX on behalf of ZZZ