How To Block Email Using Subject Headers In Postfix

Author: erics, December 7th, 2021

I needed to block email based on the Subject header. The solution is simple: Edit main.cf as root and uncomment or add:

header_checks = regexp:/etc/postfix/header_checks

1	header_checks = regexp:/etc/postfix/header_checks

Next, creaate or edit /etc/postfix/header_checks as root and add the following line:

/subject:\sbad subject text here/        REJECT  header_checks NO SPAM ALLOWED
/subject:\stest subject text here/        DISCARD  header_checks NO SPAM ALLOWED

1 2	/subject:\sbad subject text here/ REJECT header_checks NO SPAM ALLOWED /subject:\stest subject text here/ DISCARD header_checks NO SPAM ALLOWED

Finally, run sudo postfix reload NOTE: Do NOT add the “i” after the regular expression! It is case-insensitive by […]

Categories: How-To's, Technology Tags: Block, Check, Checks, Discard, Header, header_checks, headers, howto, PostFix, Reject, Spam, Subject, tips | No comments

How To Install/Update CPAN on MacOS Mojave with fatal error: ‘EXTERN.h’ file not found

Author: erics, June 12th, 2019

The Problem Tried to install the latest version of cpan and got stuck. Tracked it down to the dependency module Mac::SystemDirectory which was failing to build:

cpan[1]> install Mac::SystemDirectory                                                                                                                                                                                                                                                    
Reading '/var/root/.cpan/Metadata'
  Database was generated on Sun, 09 Jun 2019 07:17:02 GMT
Running install for module 'Mac::SystemDirectory'
Running make for E/ET/ETHER/Mac-SystemDirectory-0.10.tar.gz
Checksum for /var/root/.cpan/sources/authors/id/E/ET/ETHER/Mac-SystemDirectory-0.10.tar.gz ok
Scanning cache /var/root/.cpan/build for sizes
............................................................................DONE

  CPAN.pm: Building E/ET/ETHER/Mac-SystemDirectory-0.10.tar.gz

HASCOMPILEREZFt/TESTUSSI.c:2:10: fatal error: 'EXTERN.h' file not found
#include "EXTERN.h"
         ^~~~~~~~~~
1 error generated.
Couldn't execute cc  -g -pipe -fno-common -DPERL_DARWIN -fno-strict-aliasing -fstack-protector -Os "-I/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE"   -c HASCOMPILEREZFt/TESTUSSI.c -o HASCOMPILEREZFt/TESTUSSI.o: Inappropriate ioctl for device at Makefile.PL line 14.
Requires a compiler
Warning: No success on command[/usr/bin/perl Makefile.PL INC=-I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE]
  ETHER/Mac-SystemDirectory-0.10.tar.gz
  /usr/bin/perl Makefile.PL INC=-I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE -- NOT OK
Running make test
  Make had some problems, won't test
Running make install
  Make had some problems, won't install
Failed during this command:
 ETHER/Mac-SystemDirectory-0.10.tar.gz        : writemakefile NO '/usr/bin/perl Makefile.PL INC=-I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE' returned status 6400

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

cpan[1]> install Mac::SystemDirectory

Reading '/var/root/.cpan/Metadata'

Database was generated on Sun, 09 Jun 2019 07:17:02 GMT

Running install for module 'Mac::SystemDirectory'

Running make for E/ET/ETHER/Mac-SystemDirectory-0.10.tar.gz

Checksum for /var/root/.cpan/sources/authors/id/E/ET/ETHER/Mac-SystemDirectory-0.10.tar.gz ok

Scanning cache /var/root/.cpan/build for sizes

............................................................................DONE

CPAN.pm: Building E/ET/ETHER/Mac-SystemDirectory-0.10.tar.gz

HASCOMPILEREZFt/TESTUSSI.c:2:10: fatal error: 'EXTERN.h' file not found

#include "EXTERN.h"

^~~~~~~~~~

1 error generated.

Couldn't execute cc -g -pipe -fno-common -DPERL_DARWIN -fno-strict-aliasing -fstack-protector -Os "-I/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE" -c HASCOMPILEREZFt/TESTUSSI.c -o HASCOMPILEREZFt/TESTUSSI.o: Inappropriate ioctl for device at Makefile.PL line 14.

Requires a compiler

Warning: No success on command[/usr/bin/perl Makefile.PL INC=-I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE]

ETHER/Mac-SystemDirectory-0.10.tar.gz

/usr/bin/perl Makefile.PL INC=-I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE -- NOT OK

Running make test

Make had some problems, won't test

Running make install

Make had some problems, won't install

Failed during this command:

ETHER/Mac-SystemDirectory-0.10.tar.gz : writemakefile NO '/usr/bin/perl Makefile.PL INC=-I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE' returned status 6400

The Solution Use the MacOS installer command to deploy the needed files:

xcode-select --install
sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
installer: Package name is macOS_SDK_headers_for_macOS_10.14
installer: Installing at base path /
installer: The install was successful.

1

2

3

4

5

xcode-select --install

sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /

installer: Package name is macOS_SDK_headers_for_macOS_10.14

installer: Installing at base path /

installer: The install was successful.

The, rerunning the cpan install works:

cpan[1]> install Mac::SystemDirectory                                                                                                                                                                                                                                                    
...
Running make install
Files found in blib/arch: installing files in blib/lib into architecture dependent library tree
Installing /Library/Perl/5.18/darwin-thread-multi-2level/auto/Mac/SystemDirectory/SystemDirectory.bs
Installing /Library/Perl/5.18/darwin-thread-multi-2level/auto/Mac/SystemDirectory/SystemDirectory.bundle
Installing /Library/Perl/5.18/darwin-thread-multi-2level/Mac/SystemDirectory.pm
Installing /usr/local/share/man/man3/Mac::SystemDirectory.3pm
Appending installation info to /Library/Perl/Updates/5.18.2/darwin-thread-multi-2level/perllocal.pod
  ETHER/Mac-SystemDirectory-0.10.tar.gz
  /usr/bin/make install  -- OK

1

2

3

4

5

6

7

8

9

10

11

cpan[1]> install Mac::SystemDirectory

...

Running make install

Files found in blib/arch: installing files in blib/lib into architecture dependent library tree

Installing /Library/Perl/5.18/darwin-thread-multi-2level/auto/Mac/SystemDirectory/SystemDirectory.bs

Installing /Library/Perl/5.18/darwin-thread-multi-2level/auto/Mac/SystemDirectory/SystemDirectory.bundle

Installing /Library/Perl/5.18/darwin-thread-multi-2level/Mac/SystemDirectory.pm

Installing /usr/local/share/man/man3/Mac::SystemDirectory.3pm

Appending installation info to /Library/Perl/Updates/5.18.2/darwin-thread-multi-2level/perllocal.pod

ETHER/Mac-SystemDirectory-0.10.tar.gz

/usr/bin/make install -- OK

Categories: How-To's, Technology Tags: 10.14, CPAN, Error, extern.h, Fatal, Fatal Error, File not found, Header, headers, howto, Install, installer, Libraries, Library, MacOS, Mojave, not found, Package, perl, pkg, System, tips, update, upgrade, XCode | No comments

How To Get SMF 2.0.6 to Open in a New Frame

Author: erics, October 23rd, 2013

The latest patch version of the SMF forum, 2.0.6, now prevents the site from opening up in an HTML frame. Simply comment out line 104 inside index.php: The Problem: $ grep -Rni X-Frame-Options * index.php:104: header(‘X-Frame-Options: SAMEORIGIN’); The Solution: //header(‘X-Frame-Options: SAMEORIGIN’);

Categories: How-To's, Technology Tags: forum, Frame, Header, howto, html, iFrame, index.php, php, SAMEORIGIN, smf, tips, X-Frame-Options | No comments

How To Get WordPress To Open A New Page In An iFrame

Author: erics, July 30th, 2011

Edit the file wordpress/wp-includes/functions.php and just comment out the line in the middle:

function send_frame_options_header() {
    //@header( 'X-Frame-Options: SAMEORIGIN' );
}

1

2

3

function send_frame_options_header() {

//@header( 'X-Frame-Options: SAMEORIGIN' );

}

UPDATE: Based on Brent’s comment, here is a better solution:

remove_action( 'login_init', 'send_frame_options_header' );
remove_action( 'admin_init', 'send_frame_options_header' );

1 2	remove_action( 'login_init', 'send_frame_options_header' ); remove_action( 'admin_init', 'send_frame_options_header' );

Categories: How-To's, Technology Tags: Frame, Header, howto, HTTP Header, iFrame, tips, WordPress, X-Frame-Options | 3 comments

How To Block Email Using Subject Headers In Postfix

How To Install/Update CPAN on MacOS Mojave with fatal error: ‘EXTERN.h’ file not found

How To Get SMF 2.0.6 to Open in a New Frame

How To Get WordPress To Open A New Page In An iFrame

Our Link Network

Business

Client Websites

Fine Dining

Friends & Family

Galleries

Health

Resources

Technology

Travel

The Archives

Latest Ramblings…

Various Topics of No Interest