URGENT help needed with Postfix which stopped working on 11 Jan 2025 Saturday at about 3.00 AM

Subject: URGENT help needed with Postfix which stopped working on 11 Jan 2025 Saturday at about 3.00 AM


SYSTEM INFORMATION

OS type and version AlmaLinux 9.5

Webmin version 2.202

Virtualmin version 7.30.4

Webserver version 2.4.62

Related packages Postfix


Dear Virtualmin and Webmin and Postfix community,


I have stopped receiving emails since 11 Jan 2025 Saturday at about 3.00 AM.


I tried rebooting my AlmaLinux 9.5 Virtual Private Server (VPS) and restarting Postfix but to no avail.


Whenever I try to start Postfix, the service would be killed by the OOM Killer almost immediately.


Running "systemctl status postfix" shows oom-kill.


When I checked /var/log/messages, many related services were also killed by the OOM Killer.


But this is strange. This should not be happening at all because I have 8 GB of physical memory for my VPS.


But I do notice there were 100+ messages inside the Postfix message queue. Did my email account(s) get compromised by hackers?


Then I tried uninstalling the Postfix package and reinstalling Postfix from within Virtualmin.


After doing this, there were no more oom-kill error messages but Postfix is still not working!


I suspect that all the Postfix configuration was lost after uninstalling and reinstalling. The message queue was also reduced to zero.


Before flying to Seoul, South Korea on 7 Jan 2025 Tuesday, I had made a backup of all Virtual Servers and all Virtualmin settings on 5 Jan 2025 Sunday.


Inside the backup archive "virtualmin.tar.gz", I have the following backup files.


 Volume in drive E is Local Disk

 Volume Serial Number is 287E-92C9


 Directory of E:\temp


13/01/2025  05:16 PM    <DIR>          .

13/01/2025  05:16 PM                 0 filelist.txt

05/01/2025  10:46 PM                 0 virtualmin_chroot

05/01/2025  10:46 PM             8,615 virtualmin_config

14/12/2022  04:45 PM                 0 virtualmin_custom

14/12/2022  04:45 PM                 0 virtualmin_custom_linkcats

14/12/2022  04:45 PM                 0 virtualmin_custom_links

05/01/2025  10:46 PM                 0 virtualmin_custom_shells

05/01/2025  10:46 PM            20,480 virtualmin_email

05/01/2025  10:46 PM                 2 virtualmin_mailserver

05/01/2025  10:46 PM               135 virtualmin_mailserver_dkim

21/10/2021  08:57 PM             1,679 virtualmin_mailserver_dkimkey

05/01/2025  10:46 PM                20 virtualmin_mailserver_grey

22/09/2016  04:09 PM             9,666 virtualmin_mailserver_greyclients

22/09/2016  04:09 PM               188 virtualmin_mailserver_greyrecipients

31/12/2024  05:26 PM            30,146 virtualmin_mailserver_maincf

23/11/2023  02:10 PM             6,408 virtualmin_mailserver_mastercf

05/01/2025  10:46 PM                20 virtualmin_mailserver_ratelimit

02/02/2022  01:38 AM             5,592 virtualmin_mailserver_ratelimitconfig

05/01/2025  10:46 PM            10,240 virtualmin_scheds

05/01/2025  10:46 PM            10,240 virtualmin_scripts

05/01/2025  10:46 PM            20,480 virtualmin_templates

14/12/2022  04:45 PM                 0 virtualmin_templates_global

05/01/2025  10:46 PM            10,240 virtualmin_templates_plans

05/01/2025  10:46 PM            10,240 virtualmin_templates_skel_0

              24 File(s)        144,391 bytes

               1 Dir(s)  641,303,912,448 bytes free


How should I go about restoring the Postfix configuration which was lost after uninstalling and reinstalling?


Please advise.


Thank you very much.


Regards,


Mr. Turritopsis Dohrnii Teo En Ming

Targeted Individual in Singapore

13 Jan 2025 Monday 5.26 PM


*******************************************************************************************************************


Good day from Singapore,


My Postfix service is now working after I restored main.cf and master.cf Postfix configuration files from the backup archive “virtualmin.tar.gz”.


I can now receive emails.


May I know which other configuration files I would need to restore from the backup archive “virtualmin.tar.gz”??? Just in case I miss out something.


Please advise.


Thank you.


Regards,


Mr. Turritopsis Dohrnii Teo En Ming

Targeted Individual in Singapore

13 Jan 2025 Monday 6.00 PM





REFERENCES

==============


[1] https://forum.virtualmin.com/t/urgent-help-needed-with-postfix-which-stopped-working-on-11-jan-2025-saturday-at-about-3-00-am/131534


[2] https://sourceforge.net/p/webadmin/mailman/message/59117703/


[3] https://marc.info/?l=webmin-l&m=173676092620352&w=2


[4] https://www.mail-archive.com/postfix-users@postfix.org/msg104774.html


[5] https://marc.info/?l=postfix-users&m=173676931625696&w=2



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