Our Mail Server Countinously Revamped

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admin
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Posts: 21
Joined: March 7th, 2022, 1:09 am

Our Mail Server Countinously Revamped

Post by admin »

Email Marketing is about TRUST and Consistency, beneficial in the long term, There's No success at a glance!
A Good product... With Good advertising tools, skills and techniques...
and by Using a Well Developed and Maintained Mail Server with an accurate e-course Double Opt-In Mailing List system...
your odds are greater that you will get a lot more chances!

We'll continue to poke around on most noteworthy mailing system, because our mail server itself has actually been completely revamped, It sports a much more modern and sleek look system, while still reflecting the simplicity.

Onward & Upward!
Image
Jerry Salfaian

Here you'll find our latest online mail server status report:
  • Mail server validation report from MX Tool Box
  • Virus and malware checker from Virus Total
  • Multi RBL checker from Anti Abuse
Note: *Refresh your browse if you've got slow internet connection or bad result

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admin
Site Admin
Posts: 21
Joined: March 7th, 2022, 1:09 am

Re: Our Mail Server Countinously Revamped

Post by admin »

Suddenly I've got problems with my Mail Server on Sunday, March 20th 2022 at 1:15 pm (PST)
My mail server got email spoofing attack, that's why my server got down a few times.
It's all about spamd startup configuration failed to start.
The vulnerable security settings on major software changes:
  • Firewall
  • Zend Engine
  • Ioncube
  • Php secure
  • MySql
and many RBL vendor sites flagged blacklist to my mail server.
My private email address flooded with complain from many sources.
I've been working for 48 hours to fixing and re-configuring my mail server from the vulnerable security setting
and all of my websites re-setting too...
without even sleep...
and as a result...
finally on Wednesday, March 23rd 2022 at : 7:33 pm (PST) everything's working fine.

For reference: https://en.wikipedia.org/wiki/Email_spoofing
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admin
Site Admin
Posts: 21
Joined: March 7th, 2022, 1:09 am

Re: Our Mail Server Countinously Revamped

Post by admin »

Background Process Killer

According cPanel in WHM...
Home /System Health /Background Process Killer

You can configure WHM to kill any of the following processes and send you an email when it finds one of them. Malicious users may run an IRC bouncer on their shell accounts even though this may be against your policy. WHM detects these processes correctly even if the bouncer is renamed (e.g. to something that appears non-malicious like “pine”, to give the impression that the user is just reading email).

Please check the names of any programs you do not want running on your server; we recommend that you check them all since letting users run IRC bots and servers usually leads to denial-of-service attacks.

Processes
(v) BitchX
(v) bnc
(v) eggdrop
(v) generic-sniffers
(v) guardservices
(v) ircd
(v) psyBNC
(v) ptlink
(v) services

Keep Trusted users (optional)* with blank text...
And Click the Save Button.

Apache mod_userdir Tweak

Home /Security Center /Apache mod_userdir Tweak

Apache httpd’s mod_userdir makes URLs like “http://example.com/~fred” resolve to the indicated user’s (for example, the user “fred”’s) primary web virtual host.

In the above scenario, the transferred data counts against the bandwidth limit for the user that owns “example.com”, not against “fred”’s bandwidth limit. This is often an undesirable behavior.

WHM’s mod_userdir Protection feature addresses this problem by restricting mod_userdir to URLs whose users own the URL’s domains.

Thick mark --> Enable mod_userdir Protection
Untick mark/blank all of the host for:
Exclude Protection option --> blank,
additional user --> blank.
And Click the Save Button.
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admin
Site Admin
Posts: 21
Joined: March 7th, 2022, 1:09 am

Re: Our Mail Server Countinously Revamped

Post by admin »

To get more secure, stable and faster mail server on Exim configuration tweaks... and to get rid out from these:
Spammers, Abusers, Phishing attack...
and for the mitigation purpose, I've already blocked or rejected Dovecot connection Authentication process failure, TLS error on connection, SMTP error connection with TCP/IP call and inbound emails from all over the world:

Blocked Countries
Your server rejects mail that originates from these countries. (A new browser tab will appear.)

except from :

Trusted legal mail user
Users on the system that may set the From: header to anything they like when "Rewrite From: header to match actual sender" is enabled.

Trusted IP's Address
IP addresses exempt from all SMTP sender, recipient, spam, and relaying checks. IP addresses you enter here are stored in /etc/skipsmtpcheckhosts.
These senders must still use an RFC-compliant HELO name if the Require RFC-compliant HELO setting is enabled.

within WHM:
Home /Service Configuration /Exim Configuration Manager/ Basic Editor Tab /Access List

Now my mail server running excellent using CSF-firewall, compiled with sleek WHM exim configuration tweaks!

Code: Select all

[root@srv8 ~]# hostnamectl
   Static hostname: srv8.jsalfianmarketing.com
         Icon name: computer-desktop
           Chassis: desktop
        Machine ID: 9d9843c00baa42cfb6faxxxf725cdc5e
           Boot ID: 9281xxx105a7437481b96a640749090f
  Operating System: CloudLinux 7.9 (Boris Yegorov)
       CPE OS Name: cpe:/o:cloudlinux:cloudlinux:7.9:GA:server
            Kernel: Linux 3.10.0-962.3.2.lve1.5.73.el7.x86_64
      Architecture: x86-64

[root@srv8 ~]# cat /usr/local/cpanel/version
11.102.0.23

[root@srv8 ~]#
Image

Displaying of /var/log/exim_mainlog:
Say goodbye to all of Spammers, Abusers, Phishing attacker... FOREVER!

Code: Select all

2022-10-05 20:50:54 SMTP connection from [52.52.26.65]:54284 (TCP/IP connection count = 1)
2022-10-05 20:51:35 H=ca1.mx-check.com (mx-check.com) [52.52.26.65]:54284 X=TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no F= temporarily rejected RCPT : Deferred due to greylisting. Host: '52.52.26.65' From: 'check@mx-check.com' To: 'postmaster@business-mailers.com' SPF: 'unchecked'
2022-10-05 20:52:37 cwd=/etc/csf 2 args: /usr/sbin/exim -bpc
2022-10-05 20:53:31 unexpected disconnection while reading SMTP command from ca1.mx-check.com (mx-check.com) [52.52.26.65]:54284 D=2m36s
2022-10-05 20:54:16 cwd=/var/spool/exim 2 args: /usr/sbin/exim -q
2022-10-05 21:04:00 SMTP connection from [162.142.125.10]:36772 (TCP/IP connection count = 1)
2022-10-05 21:04:02 SMTP connection from [177.174.0.133]:33080 (TCP/IP connection count = 2)
2022-10-05 21:04:04 H=[177.174.0.133]:33080 X=TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no rejected connection in "connect" ACL: Country is banned
2022-10-05 21:04:04 SMTP connection from [177.174.0.133]:33080 closed by DROP in ACL
2022-10-05 21:04:22 H=scanner-04.ch1.censys-scanner.com [162.142.125.10]:36772 rejected connection in "connect" ACL: Host is banned
2022-10-05 21:04:22 SMTP connection from scanner-04.ch1.censys-scanner.com [162.142.125.10]:36772 closed by DROP in ACL
2022-10-05 21:05:19 SMTP connection from [43.131.49.100]:49656 (TCP/IP connection count = 1)
2022-10-05 21:05:19 H=[43.131.49.100]:49656 rejected connection in "connect" ACL: Country is banned
2022-10-05 21:05:19 SMTP connection from [43.131.49.100]:49656 closed by DROP in ACL
2022-10-05 21:05:19 no host name found for IP address 43.131.49.100
2022-10-05 21:07:08 SMTP connection from [45.83.65.96]:30546 (TCP/IP connection count = 1)
2022-10-05 21:07:09 H=[45.83.65.96]:30546 X=TLS1.2:ECDHE-RSA-AES128-GCM-SHA256:128 CV=no rejected connection in "connect" ACL: Country is banned
2022-10-05 21:07:09 SMTP connection from [45.83.65.96]:30546 closed by DROP in ACL
2022-10-05 21:07:09 no host name found for IP address 45.83.65.96
2022-10-05 21:07:39 cwd=/etc/csf 2 args: /usr/sbin/exim -bpc
2022-10-05 21:09:01 SMTP connection from [45.83.64.220]:23588 (TCP/IP connection count = 1)
2022-10-05 21:09:01 H=[45.83.64.220]:23588 X=TLS1.2:ECDHE-RSA-AES128-GCM-SHA256:128 CV=no rejected connection in "connect" ACL: Country is banned
2022-10-05 21:09:01 SMTP connection from [45.83.64.220]:23588 closed by DROP in ACL
2022-10-05 21:09:01 no host name found for IP address 45.83.64.220
2022-10-05 21:11:14 SMTP connection from [87.236.176.233]:34209 (TCP/IP connection count = 1)
2022-10-05 21:11:14 H=[87.236.176.233]:34209 rejected connection in "connect" ACL: Country is banned
2022-10-05 21:11:14 SMTP connection from [87.236.176.233]:34209 closed by DROP in ACL
2022-10-05 21:11:16 SMTP connection from [104.248.203.191]:54131 (TCP/IP connection count = 1)
2022-10-05 21:11:16 H=[104.248.203.191]:54131 rejected connection in "connect" ACL: Country is banned
2022-10-05 21:11:16 SMTP connection from [104.248.203.191]:54131 closed by DROP in ACL
2022-10-05 21:11:29 SMTP connection from [180.76.179.193]:33432 (TCP/IP connection count = 1)
2022-10-05 21:11:29 H=[180.76.179.193]:33432 rejected connection in "connect" ACL: Country is banned
2022-10-05 21:11:29 SMTP connection from [180.76.179.193]:33432 closed by DROP in ACL
2022-10-05 21:11:29 SMTP connection from [180.76.179.193]:33446 (TCP/IP connection count = 2)
2022-10-05 21:11:29 H=[180.76.179.193]:33446 rejected connection in "connect" ACL: Country is banned
2022-10-05 21:11:29 SMTP connection from [180.76.179.193]:33446 closed by DROP in ACL
2022-10-05 21:11:29 no host name found for IP address 180.76.179.193
2022-10-05 21:11:29 no host name found for IP address 180.76.179.193
2022-10-05 21:11:53 SMTP connection from [159.223.48.120]:44608 (TCP/IP connection count = 1)
2022-10-05 21:11:54 no host name found for IP address 159.223.48.120
2022-10-05 21:11:54 SMTP call from [159.223.48.120]:44608 dropped: too many unrecognized commands (last was "Connection: close")
2022-10-05 21:12:40 cwd=/etc/csf 2 args: /usr/sbin/exim -bpc
2022-10-05 21:13:58 SMTP connection from [43.157.18.137]:61736 (TCP/IP connection count = 1)
2022-10-05 21:13:58 H=[43.157.18.137]:61736 rejected connection in "connect" ACL: Country is banned
2022-10-05 21:13:58 SMTP connection from [43.157.18.137]:61736 closed by DROP in ACL
2022-10-05 21:13:58 no host name found for IP address 43.157.18.137
2022-10-05 21:15:19 SMTP connection from [186.193.230.60]:65115 (TCP/IP connection count = 1)
2022-10-05 21:15:22 H=[186.193.230.60]:65115 X=TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no rejected connection in "connect" ACL: Country is banned
2022-10-05 21:15:22 SMTP connection from [186.193.230.60]:65115 closed by DROP in ACL
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