Thanks Wietse and Matus. I understand that I must work this way, examples:
if /^Subject:/ /^Subject: Invest once and get passive income(.*)/ DISCARD SUBJECTSPAM2293 /^Subject: Earnings on a trading robot(.*)/ DISCARD SUBJECTSPAM2294 /^Subject: Working Online At Home(.*)/ DISCARD SUBJECTSPAM2295 /^Subject: Netflix Je account(.*)/ DISCARD SUBJECTSPAM2296 /^Subject: Mailbox Size Warning(.*)/ DISCARD SUBJECTSPAM2297 /^Subject:(.*)Sunrise ritual(.*)/ DISCARD SUBJECTSPAM2298 /^Subject:(.*)pending messages on hold(.*)/ DISCARD SUBJECTSPAM2299 endif /usr/sbin/postmap -v -h -q - pcre:/etc/postfix/header_checks < /etc/postfix/header_checks In main.cf i add this: header_checks = pcre:/etc/postfix/header_checks This is my server hardware: Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz 32 Gb RAM On Fri, Oct 1, 2021 at 2:33 PM Wietse Venema <wie...@porcupine.org> wrote: > SysAdmin EM: > > Hello Wietse. Thank you for your answer, you are always attentive to > > everyone, you were very kind. > > > > I'm going to start using pcre, in the header_checks file I have certain > > locks to prevent sending spam or phishing. > > > > /^Subject: Invest once and get passive income.*/ > > DISCARD SUBJECTSPAM2293 > > /^Subject: Earnings on a trading robot.*/ DISCARD > > SUBJECTSPAM2294 > > /^Subject: Working Online At Home.*/ DISCARD > > SUBJECTSPAM2295 > > /^Subject: Netflix Je account.*/ DISCARD > > SUBJECTSPAM2296 > > /^Subject: Mailbox Size Warning.*/ DISCARD > > SUBJECTSPAM2297 > > /^Subject:.*Sunrise ritual.*/ DISCARD SUBJECTSPAM2298 > > /^Subject:.*pending messages on hold.*/ DISCARD > > SUBJECTSPAM2299 > > First, DISCARD is not a nice way to eiminate spam if you have many > users. > > Second, the .* at the end is not needed, but I do not expect that > is causing high CPU usage. > > You can save lots of CPU if you have many Subject: patterns, by > using if-endif. > > if /^Subject:/ > # No whitespace before patterns between if-endif > /^Subject: *this/ > /^Subject:.*that/ > ... > endif > > With this, message headers that aren't a Subject will use very > little CPU. > > Wietse >
