{"id":3336,"date":"2015-02-08T14:47:37","date_gmt":"2015-02-08T13:47:37","guid":{"rendered":"http:\/\/blog.websupport.cz\/?p=3336"},"modified":"2025-03-11T21:18:23","modified_gmt":"2025-03-11T20:18:23","slug":"zbrojime-na-souboj-se-spamem-2-cast","status":"publish","type":"post","link":"https:\/\/www.websupport.cz\/blog\/2015\/02\/zbrojime-na-souboj-se-spamem-2-cast\/","title":{"rendered":"Zbroj\u00edme na souboj se spamem (2. \u010d\u00e1st)"},"content":{"rendered":"

Tento blog je pokra\u010dov\u00e1n\u00edm m\u00e9ho rok star\u00e9ho \u010dl\u00e1nku<\/a> o tom, co d\u011bl\u00e1me v boji proti odchoz\u00edmu spamu. Za t\u011bch posledn\u00edch dvan\u00e1ct m\u011bs\u00edc\u016f jsme se zase po\u0159\u00e1dn\u011b posunuli.\u00a0Osobn\u011b si mysl\u00edm, \u017ee m\u00e1lokdo na Slovensku, a mo\u017en\u00e1 tak\u00e9 v \u010cesku, d\u011bl\u00e1 tak mnoho v boji proti spam\u016fm.<\/em><\/p>\n

Vych\u00e1z\u00ed to z faktu, \u017ee denn\u011b ode\u0161leme \u00factyhodn\u00fdch jeden a p\u016fl milionu mail\u016f a oproti klasick\u00fdm ISP se \u017eiv\u00edme hlavn\u011b provozem web\u016f. A z toho vych\u00e1z\u00ed velk\u00e9 mno\u017estv\u00ed na\u0161ich probl\u00e9m\u016f a v\u00fdzev.\u00a0Hostujeme internet takov\u00fd, jak\u00fd je – dynamick\u00fd a drav\u00fd, ale i zraniteln\u00fd, divok\u00fd a ob\u010das nef\u00e9rov\u00fd. Mno\u017estv\u00ed spamu, kter\u00fd k n\u00e1m p\u0159ich\u00e1z\u00ed a sna\u017e\u00ed se tak\u00e9 odej\u00edt, jednodu\u0161e vych\u00e1z\u00ed z faktu, \u017ee provozujeme obrovsk\u00e9 mno\u017estv\u00ed webov\u00fdch str\u00e1nek a po\u0161tovn\u00edch schr\u00e1nek, kter\u00e9 samy o sob\u011b generuj\u00ed hromady\u00a0mail\u016f. Pr\u00e1v\u011b ty ob\u010das padnou na nejasnou \u010d\u00e1ru\u00a0–\u00a0“vy\u017e\u00e1danou” a “nevy\u017e\u00e1danou” po\u0161tu. Ale hlavn\u011b,\u00a0bez rozd\u00edlu o jakou str\u00e1nku se jedn\u00e1, na v\u0161echny neust\u00e1le \u0165ukaj\u00ed hacke\u0159i z cel\u00e9ho sv\u011bta s jedn\u00edm hlavn\u00edm z\u00e1m\u011brem – odeslat si od n\u00e1s n\u011bjak\u00fd spam.<\/p>\n

Takhle vypad\u00e1 mno\u017estv\u00ed n\u00e1mi zpracovan\u00e9 po\u0161ty v jeden den. V celkov\u00fdch \u010d\u00edslech chyb\u00ed asi t\u0159etina infrastruktury, ale z pr\u016fb\u011bhu je vid\u011bt, \u017ee\u00a0na\u0161i u\u017eivatel\u00e9\u00a0pos\u00edlaj\u00ed emaily nejv\u00edce r\u00e1no po p\u0159\u00edchodu do pr\u00e1ce a potom ve\u010der, kdy\u017e doraz\u00ed dom\u016f. Ob\u010das na grafu re\u00e1ln\u011b vid\u00edme, hlavn\u011b v p\u0159\u00edpad\u011b zhor\u0161en\u00ed po\u010das\u00ed, odpoledn\u00ed dopravn\u00ed z\u00e1cpu :)<\/p>\n

\"Spam1\"<\/a><\/p>\n

Nejprve ale zrekapitulujme, co d\u011bl\u00e1me proti spamu. Jako \u00fapln\u00fd z\u00e1klad: p\u0159\u00edchoz\u00ed SMTP servery si ov\u011b\u0159ujeme v black-listech Spamhausu<\/a> a kontrolujeme SPF z\u00e1znamy. U odchoz\u00ed po\u0161ty kontrolujeme hlavi\u010dky mail\u016f, zda sed\u00ed s na\u0161imi mailboxy. K tomu pou\u017e\u00edv\u00e1me anti-spam od ESETu a pro jistotu nov\u011b i open-source SpamAssassin<\/a>.<\/p>\n

P\u0159ihla\u0161ov\u00e1n\u00ed do schr\u00e1nek a na SMTP server limitujeme GeoIP ochranou na vybran\u00e9 zem\u011b. U\u017eivatel\u00e9 si mohou libovolnou zemi povolit a p\u0159idat. Je to ale i tak pom\u011brn\u011b nepopul\u00e1rn\u00ed, i kdy\u017e z technick\u00e9ho pohledu \u00fa\u017easn\u011b \u00fa\u010dinn\u00e9 \u0159e\u0161en\u00ed. P\u0159esto se n\u00e1m ale st\u00e1valo, \u017ee hacke\u0159i dok\u00e1zali \u00fato\u010dit na schr\u00e1nky z IP adres povolen\u00fdch zem\u00ed. Vyhodnocujeme proto, pokud se n\u011bkdo v kr\u00e1tk\u00e9m \u010dase z\u00e1zra\u010dn\u011b p\u0159esune z jedn\u00e9 povolen\u00e9 zem\u011b do jin\u00e9 povolen\u00e9, kter\u00e9 spolu ale nesoused\u00ed. Pokud ano, schr\u00e1nku mu tehdy zablokujeme. \u00dadajn\u011b to tak d\u011blaj\u00ed i mobiln\u00ed oper\u00e1to\u0159i se SIM kartami. Pamatuji si jeden star\u00fd urban legend o letci kanadsk\u00e9 vojensk\u00e9 st\u00edha\u010dky, kter\u00fd prolet\u011bl Kanadou tak rychle, \u017ee mu podobn\u00fd ochrann\u00fd algoritmus zablokoval mobil.<\/p>\n

Pro p\u0159ihla\u0161ov\u00e1n\u00ed do webmailu jsme p\u0159idali nen\u00e1padn\u00fd kus Javascript k\u00f3du, kter\u00fd rozli\u0161uje mezi \u010dlov\u011bkem a strojem plus detekuje pou\u017eit\u00ed my\u0161i. Tohle n\u00e1m dost pomohlo.<\/p>\n

D\u00e1le jsme p\u0159idali velk\u00e9 mno\u017estv\u00ed statistick\u00fdch kontrol. V\u0161echny ale st\u00e1ly a padaly na tom, \u017ee jsme pot\u0159ebovali sjednotit na jedno m\u00edsto logy ze v\u0161ech na\u0161ich mailov\u00fdch, ale i jin\u00fdch server\u016f. Jen t\u011bch po\u0161tovn\u00edch server\u016f, kter\u00e9 m\u00e1me vystr\u010den\u00e9 do sv\u011bta, je sedmdes\u00e1t sedm. Proto jsme rozjeli grandi\u00f3zn\u00ed a velmi \u00fasp\u011b\u0161n\u00fd projekt centralizovan\u00e9 datab\u00e1ze v\u0161ech na\u0161ich log\u016f. B\u011b\u017e\u00ed to na logstash managementu s elastic-search datab\u00e1z\u00ed a na grafick\u00e9 vyhodnocen\u00ed log\u016f pou\u017e\u00edv\u00e1me n\u00e1stroj kibana. Denn\u011b zaznamen\u00e1me 350 milion\u016f log\u016f a dr\u017e\u00edme dvout\u00fddenn\u00ed historii. B\u011b\u017e\u00ed n\u00e1m to skv\u011ble na dvou nov\u00fdch a \u010dty\u0159ech star\u0161\u00edch fyzick\u00fdch serverech.<\/p>\n

Centralizovan\u00fd log server vyu\u017e\u00edv\u00e1me tak\u00e9 na vyhled\u00e1v\u00e1n\u00ed r\u016fzn\u00fdch anom\u00e1li\u00ed. Pokud se nap\u0159\u00edklad sna\u017e\u00ed n\u011bjak\u00fd po\u0161tovn\u00ed \u00fa\u010det poslat ur\u010dit\u00fd po\u010det zpr\u00e1v za hodinu, kter\u00e9 n\u00e1\u0161 syst\u00e9m ozna\u010d\u00ed za spam, blokujeme cel\u00e9 konto a automaticky upozor\u0148ujeme u\u017eivatele. Pokud pos\u00edl\u00e1 n\u011bkdo velk\u00e9 mno\u017estv\u00ed legitimn\u00edch mail\u016f, p\u0159e\u0159ad\u00ed ho syst\u00e9m automaticky na jin\u00fd mailout server. Pokud m\u00e1 u n\u00e1s n\u011bkdo “pochybnou” minulost z pohledu zas\u00edl\u00e1n\u00ed spamu, dost\u00e1v\u00e1 se tak\u00e9 na jin\u00fd mailout server. P\u0159id\u00e1vat nov\u00e1 pravidla je nyn\u00ed ji\u017e jednodu\u0161\u0161\u00ed, ne\u017e je vym\u00fd\u0161let.<\/p>\n

Zde je graf p\u0159\u00edchoz\u00edch a odchoz\u00edch spam\u016f z \u010d\u00e1sti na\u0161\u00ed infrastruktury. Zat\u00edmco v minulosti musel n\u00e1\u0161 ESET anti-spam zastavit t\u00e9m\u011b\u0159 200 tis\u00edc spam\u016f denn\u011b, dnes je to u\u017e jen asi desetina. Pr\u00e1v\u011b kv\u016fli automatick\u00fdm ochran\u00e1m, kter\u00e9 spam odchyt\u00e1vaj\u00ed p\u0159\u00edmo u zdroje. Sv\u011btle-modr\u00e9 jsou p\u0159\u00edchoz\u00ed spamy, ty chod\u00ed rovnom\u011brn\u011b. Tmav\u011b-modr\u00e9 jsou odchoz\u00ed z web\u016f a \u017elut\u00e9 jsou odchoz\u00ed spamy ze SMTP server\u016f. Je vid\u011bt, \u017ee jak\u00e1koliv snaha odes\u00edlat spam automaticky je syst\u00e9mem identifikov\u00e1na a ihned zastavena. Tzn. je zablokov\u00e1no konto a vyrozum\u011bn u\u017eivatel.<\/p>\n

\"Spam2\"<\/a><\/p>\n

Zavedli jsme tak\u00e9 proces sledov\u00e1n\u00ed a odpov\u00edd\u00e1n\u00ed na ka\u017ed\u00fd jeden abuse report, kter\u00fd dostaneme. Rovn\u011b\u017e sledujeme online reporty firem jako Microsoft (hotmail.com, zoznam.sk, atd.), kter\u00e9 n\u00e1m zobrazuj\u00ed statistiky spam\u016f, kter\u00e9 od n\u00e1s ode\u0161ly. Je to pracn\u00e9, ale \u00fa\u010dinn\u00e9.<\/p>\n

Velk\u00fdm zdrojem probl\u00e9m\u016f byly a jsou vyhackovan\u00e9, u n\u00e1s hostovan\u00e9, www str\u00e1nky. Je to \u0161\u00edlen\u00e1 statistika, ale a\u017e 10 procent web\u016f, kter\u00e9 hostujeme, jsou napadeny. Tak\u017ee v dan\u00e9m okam\u017eiku hostujeme p\u0159ibli\u017en\u011b 6000 napaden\u00fdch str\u00e1nek, kter\u00e9 bu\u010f DDoS-uj\u00ed ven, pos\u00edlaj\u00ed spam nebo se jen tv\u00e1\u0159\u00ed nen\u00e1padn\u011b a \u010dekaj\u00ed na budouc\u00ed povely. Pravideln\u011b v\u0161em hostovan\u00fdm str\u00e1nk\u00e1m scanujeme soubory ese\u0165\u00e1ck\u00fdm a tak\u00e9 vlastn\u00edm scannerem. Malware soubor\u016fm, kter\u00e9 najdeme, m\u011bn\u00edme pr\u00e1va, aby nebyly spustiteln\u00e9 a jejich u\u017eivatele okam\u017eit\u011b upozor\u0148ujeme.<\/p>\n

Je to d\u0159ina, ale pom\u00e1h\u00e1 to. Z m\u00e9ho pohledu nab\u00edr\u00e1 cel\u00e1 situace kolem zranitelnosti CMSek jako WordPress<\/strong>, Joomla<\/strong> apod. ne\u00fanosnou situaci. Pokud upozorn\u00edme u\u017eivatele, \u017ee m\u00e1 star\u00fd a zraniteln\u00fd CMS, v\u011bt\u0161ina z nich nev\u00ed, co s t\u00edm ud\u011blat. P\u0159i efektivit\u011b souvisej\u00edc\u00ed s t\u00edm, za jak\u00e9 ceny takov\u00e9 str\u00e1nky hostujeme, je nemo\u017en\u00e9, abychom jim je zdarma upgradovali a zabezpe\u010dovali.<\/p>\n

Blokovat v\u0161echny zraniteln\u00e9 str\u00e1nky tak\u00e9 nechceme. Proto je r\u016fzn\u00fdmi metodami vyhled\u00e1v\u00e1me a n\u011bkdy pouze \u010d\u00e1ste\u010dn\u011b omezujeme. Sv\u011btlo na konci tunelu je v podob\u011b automaticky-se-updatovan\u00fdmi CMS syst\u00e9my, tak jak je to dnes b\u011b\u017en\u00e9 pro opera\u010dn\u00ed syst\u00e9my. Jednodu\u0161e, web postaven\u00fd na WordPressu, kter\u00fd si nahod\u00edte na internet a nebudete updatovat vydr\u017e\u00ed nehacknut\u00fd tolik, jako PC\u010dko s Windows, vypnut\u00fdm firewallem, bez antiviru a zak\u00e1zan\u00fdmi aktualizacemi OS. \u010cili asi jen p\u00e1r m\u011bs\u00edc\u016f, maxim\u00e1ln\u011b tak rok, mo\u017en\u00e1 dva.<\/p>\n

Zkou\u0161eli jsme se hr\u00e1t s mod_security<\/a> modulem do apache, ale nen\u00ed to \u0161k\u00e1lovateln\u00e9 \u0159e\u0161en\u00ed pro webov\u00e9ho providera. Chr\u00e1n\u00edme z\u00e1kaznick\u00e9 weby alespo\u0148 tak, \u017ee vyu\u017e\u00edv\u00e1me centralizovan\u00e9 logov\u00e1n\u00ed a blokujeme abnorm\u00e1ln\u00ed aktivity. Nap\u0159\u00edklad n\u00e1razov\u00fd traffic z jedn\u00e9 IP adresy. Sledujeme a vyhodnocujeme, pokud m\u00e1 slovensk\u00e1 nebo \u010desk\u00e1 str\u00e1nka abnorm\u00e1ln\u00ed n\u00e1r\u016fst zahrani\u010dn\u00edho trafficu. Omezujeme p\u0159ihla\u0161ov\u00e1n\u00ed do administrativn\u00ed \u010d\u00e1sti CMS atd.. Re\u00e1ln\u00e1 technick\u00e1 ochrana proti napaden\u00ed webu typu IPS nebo IDS, jakou implementuj\u00ed d\u016fle\u017eit\u00e9 webov\u00e9 str\u00e1nky, je u n\u00e1s nepou\u017eiteln\u00e1. Polovina web\u016f by p\u0159i n\u00ed p\u0159estala fungovat.<\/p>\n

Kdy\u017e se dostane n\u00e1\u0161 mailov\u00fd server na black-list, mnoho u\u017eivatel\u016f nem\u016f\u017ee odes\u00edlat po\u0161tu. Je to dnes z\u00e1kladn\u00ed probl\u00e9m sd\u00edlen\u00e9ho hostingu. Ne v\u0161ichni si uv\u011bdomuj\u00ed tento nezbytn\u00fd kompromis, souvisej\u00edc\u00ed s efektivitou nejekonomi\u010dt\u011bj\u0161\u00ed p\u0159\u00edtomnosti na internetu – sd\u00edlen\u00fdm hostingem. Pr\u00e1ce s black-listy je ob\u010das zaj\u00edmav\u00e1. Napsali jsme si vlastn\u00ed scanner, kter\u00fd n\u00e1m monitoruje, kdy\u017e se na n\u011bjak\u00fd black-list dostaneme. Ihned potom \u017e\u00e1d\u00e1me o odstran\u011bn\u00ed z uveden\u00e9ho seznamu, ale pravidla jsou r\u016fzn\u00e1. Zde je graf, kter\u00fd n\u00e1m ukazuje po\u010det na\u0161ich mail server\u016f, kter\u00e9 jsou na black-listu. Jak vid\u00edte, tak se lep\u0161\u00edme, proto\u017ee je \u201czahnut\u00fd\u201d t\u00edm spr\u00e1vn\u00fdm sm\u011brem :)<\/p>\n

\"Spam3\"<\/a><\/p>\n

Od \u00fanora zav\u00e1d\u00edme limit na po\u010det odeslan\u00fdch email\u016f pro ka\u017edou schr\u00e1nku. Je to 300 zpr\u00e1v za hodinu. D\u016fvodem je sn\u00ed\u017een\u00ed n\u00e1sledk\u016f v p\u0159\u00edpad\u011b, kdy je vyhackovan\u00e1 po\u0161tovn\u00ed schr\u00e1nka nebo web. Kdo pot\u0159ebuje v\u00edce, vypln\u00ed n\u00e1m online formul\u00e1\u0159 s \u017e\u00e1dost\u00ed. Odezva z\u00e1kazn\u00edk\u016f byla zat\u00edm pozitivn\u00ed. Slibujeme si od toho dal\u0161\u00ed sn\u00ed\u017een\u00ed odchoz\u00edho spamu.<\/p>\n

Tohle v\u0161echno d\u011bl\u00e1me v boji proti odchoz\u00edmu spamu, nebo\u0165 ten je nejotravn\u011bj\u0161\u00ed. V podstat\u011b o tom u\u017eivatel\u00e9 ani nev\u011bd\u00ed, proto\u017ee jedin\u00e9 co poc\u00edt\u00ed je to, \u017ee odchoz\u00ed mail je v po\u0159\u00e1dku odesl\u00e1n. D\u011blat to ale efektivn\u011b pro mnoho u\u017eivatel\u016f na sd\u00edlen\u00e9 infrastruktu\u0159e, je opravdu celkem velk\u00e1 v\u011bda.<\/p>\n

Obvykle tr\u00e1p\u00ed u\u017eivatele nejv\u00edce p\u0159\u00edchoz\u00ed spam. Tady ale mus\u00edm b\u00fdt tro\u0161ku alibista, proto\u017ee nevn\u00edm\u00e1m WebSupport (webhostingov\u00e9ho providera) jako toho, kdo m\u00e1 u\u017eivateli zaru\u010den\u011b odstranit ve\u0161ker\u00fd p\u0159\u00edchoz\u00ed spam. Je to podle m\u00e9ho tak trochu i na samotn\u00fdch u\u017eivatel\u00edch. Jasn\u011b, kontrolujeme reputaci p\u0159\u00edchoz\u00edch SMTP server\u016f a do\u0161lou po\u0161tu prot\u00e1hneme anti-spam softwarem. Ale to je asi tak v\u0161echno, co se s t\u00edm d\u00e1 d\u011blat. Kdy\u017e se pod\u00edv\u00e1te na jazykovou kvalitu mnoha spam\u016f, d\u00e1 se pochopit, \u017ee je nad s\u00edly softwaru rozeznat legitimn\u00ed mail od necht\u011bn\u00e9ho. Mluvil jsem o tom s fundovan\u00fdmi lidmi v ESETu a potvrdili mi, \u017ee sp\u00ed\u0161e samotn\u00e1 reputace p\u0159\u00edchoz\u00edch SMTP server\u016f a anal\u00fdza hlavi\u010dky mailu je to, co nejv\u00edce funguje p\u0159i rozezn\u00e1v\u00e1n\u00ed spam\u016f. Jazykov\u00e9 anal\u00fdzy obsahu mailu nejsou d\u016fv\u011bryhodn\u00e9. Jsou si toho v\u011bdomi i poskytovatel\u00e9 webov\u00fdch free mail\u016f jako Gmail nebo Hotmail. Z d\u016fv\u011bryhodn\u00fdch zdroj\u016f m\u00e1m ov\u011b\u0159eno, \u017ee se spol\u00e9haj\u00ed mnohem v\u00edce (dokonce v\u00fdlu\u010dn\u011b) na sv\u00e9 u\u017eivatele, kte\u0159\u00ed ne\u017e\u00e1douc\u00ed e-mail ozna\u010d\u00ed. Spamem je potom tehdy, kdy\u017e ho tak ozna\u010d\u00ed mnoho lid\u00ed. S t\u00edm je ale v praxi tak\u00e9 probl\u00e9m. Dost u\u017eivatel\u016f ozna\u010d\u00ed za spam i zpr\u00e1vy, kter\u00e9 dostali z legitimn\u00edho newsletteru, kter\u00fd jim zaslal jeden z eshop\u016f, kde p\u0159ed \u010dasem nakoupili. Pouze jsou l\u00edn\u00ed se z n\u011bj standartn\u011b odhl\u00e1sit. Websupport tento typ kontroly pro p\u0159\u00edchoz\u00ed po\u0161tu neum\u00ed dost dob\u0159e pou\u017e\u00edt, proto\u017ee si v\u011bt\u0161ina u\u017eivatel\u016f ne\u010dte po\u0161tu p\u0159es webov\u00e9 rozhran\u00ed. Av\u0161ak Horde i RoundCube to podporuj\u00ed. Proto jsme se rozhodli tento typ kontroly p\u0159ece jenom zav\u00e9st.<\/p>\n

Trest za chybu p\u0159i ozna\u010dov\u00e1n\u00ed p\u0159\u00edchoz\u00edho spamu je obrovsk\u00fd. I proto jsme nastavili \u00farovn\u011b ozna\u010den\u00ed p\u0159\u00edchoz\u00edho spamu ve WebSupportu pom\u011brn\u011b vysoko. Mysl\u00edme si toti\u017e, \u017ee je men\u0161\u00ed probl\u00e9m, pokud neozna\u010d\u00edme tucty p\u0159\u00edchoz\u00edch spam\u016f, ne\u017e abychom za spam ozna\u010dili, nebo dokonce smazali, jen jeden d\u016fle\u017eit\u00fd a legitimn\u00ed mail.<\/p>\n

Nav\u00edc, mno\u017estv\u00ed p\u0159ijat\u00e9ho spamu je do velk\u00e9 m\u00edry v rukou ka\u017ed\u00e9ho u\u017eivatele. Je nutn\u00e9 m\u00edt ochr\u00e1n\u011bn sv\u016fj po\u010d\u00edta\u010d, nesurfovat na divn\u00fdch str\u00e1nk\u00e1ch, neinstalovat neofici\u00e1ln\u00ed software, ned\u00e1vat svou adresu na web, neposkytovat ji pochybn\u00fdm online firm\u00e1m atd.. V neposledn\u00ed \u0159ad\u011b je fajn nainstalovat si na sv\u016fj po\u010d\u00edta\u010d vlastn\u00ed anti-spam software a tro\u0161ku se vyhr\u00e1t s nastaven\u00edm.<\/p>\n

Pokud jste se dostali a\u017e sem, p\u0159ipojuji souhrn v\u0161ech v\u011bc\u00ed, kter\u00e9 se n\u00e1m v posledn\u00edm obdob\u00ed poda\u0159ilo zlep\u0161it a nasadit:<\/p>\n

1. Ov\u011b\u0159ov\u00e1n\u00ed p\u0159\u00edchoz\u00edch SMTP server\u016f v\u016f\u010di Spamhaus DB
\n2. Kontrola hlavi\u010dky odchoz\u00edch mail\u016f – je nutn\u00e9 m\u00edt u n\u00e1s \u00fa\u010det
\n3. Kontrola SPF z\u00e1znam\u016f
\n4. Anti-spam filtr ESET
\n5. Anti-spam filtr SpamAssassin
\n6. Kontrola “\u010dlov\u011bka” p\u0159i p\u0159ihla\u0161ov\u00e1n\u00ed do webmailu, p\u0159\u00edtomnost my\u0161ky
\n7. GeoIP ochrana p\u0159ihla\u0161ov\u00e1n\u00ed do schr\u00e1nky z vybran\u00fdch zem\u00ed
\n8. N\u00e1hl\u00fd pohyb \u010dlov\u011bka mezi povolen\u00fdmi GeoIP zem\u011bmi
\n9. Blokov\u00e1n\u00ed schr\u00e1nek p\u0159i odesl\u00e1n\u00ed jist\u00e9ho po\u010dtu spam\u016f
\n10. P\u0159i\u0159azen\u00ed na r\u016fzn\u00e9 mailout servery podle po\u010dtu odeslan\u00e9 po\u0161ty a “reputace”
\n11. Kontrola a odpov\u00edd\u00e1n\u00ed na p\u0159\u00edchoz\u00ed abuse reporty
\n12. Automatick\u00e1 kontrola velk\u00e9ho po\u010dtu black-list server\u016f
\n13. Proch\u00e1zen\u00ed soubor\u016f na malware
\n14. Ochrana WWW str\u00e1nek proti brute force \u00fatok\u016fm na hesla do CMS
\n15. Kontrola verz\u00ed CMS syst\u00e9m\u016f
\n16. Nastaviteln\u00fd limit na po\u010det odeslan\u00fdch mail\u016f<\/p>\n

Aktu\u00e1ln\u011b pokl\u00e1d\u00e1me situaci se spamy za uspokojivou. Pokud se v minulosti stalo, \u017ee jsme m\u011bli na black-listu i tucet po\u0161tovn\u00edch server\u016f, dnes je to tak nanejv\u00fd\u0161 jeden nebo dva servery. V\u00edm ale jist\u011b, \u017ee to nevydr\u017e\u00ed. Boj proti spamer\u016fm je boj mu\u017ee proti mu\u017ei, kde se ka\u017ed\u00e1 strana mus\u00ed p\u0159izp\u016fsobovat a posouvat dop\u0159edu. N\u011bkdy a\u017e re\u00e1ln\u011b c\u00edt\u00edme a vid\u00edme, co proti n\u00e1m d\u011bl\u00e1 druh\u00e1 strana n\u011bkde v Nig\u00e9rii nebo v Rusku. A je to zvl\u00e1\u0161tn\u00ed pocit.<\/p>\n

Je jist\u00e9, \u017ee tento blog bude m\u00edt dal\u0161\u00ed pokra\u010dov\u00e1n\u00ed a v podstat\u011b nikdy neskon\u010d\u00ed. Alespo\u0148 pokud nep\u0159ejde lidstvo na n\u011bco jin\u00e9ho, ne\u017e klasick\u00e9 e-maily. Jen tam vid\u00edm ultim\u00e1tn\u00ed \u0159e\u0161en\u00ed spam\u016f – p\u0159echod internetov\u00e9 komunikace do n\u011bjak\u00e9 ov\u011b\u0159en\u00e9, autorizovan\u00e9 a \u0161ifrovan\u00e9 formy, podobn\u00e9 dne\u0161n\u00edmu instant messagingu.<\/p>\n

Co si mysl\u00edte o spamu vy? A jak\u00fd v\u00fdvoj o\u010dek\u00e1v\u00e1te u emailu? P\u0159estaneme mailovat a za\u010dneme si ps\u00e1t zpr\u00e1vy n\u011bkde jinde? Napi\u0161te n\u00e1m va\u0161e post\u0159ehy a n\u00e1zory ke \u010dl\u00e1nku do koment\u00e1\u0159\u016f.<\/p>\n","protected":false},"excerpt":{"rendered":"

Tento blog je pokra\u010dov\u00e1n\u00edm m\u00e9ho rok star\u00e9ho \u010dl\u00e1nku o tom, co d\u011bl\u00e1me v boji proti odchoz\u00edmu spamu. Za t\u011bch posledn\u00edch dvan\u00e1ct m\u011bs\u00edc\u016f jsme se zase po\u0159\u00e1dn\u011b posunuli.\u00a0Osobn\u011b si mysl\u00edm, \u017ee m\u00e1lokdo na Slovensku, a mo\u017en\u00e1 tak\u00e9 v \u010cesku, d\u011bl\u00e1 tak mnoho v boji proti spam\u016fm. Vych\u00e1z\u00ed to z faktu, \u017ee denn\u011b ode\u0161leme \u00factyhodn\u00fdch jeden a […]<\/p>\n","protected":false},"author":35,"featured_media":3340,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,52],"tags":[325,57,326,144,19],"class_list":["post-3336","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologie","category-tipy-a-triky","tag-anti-spam","tag-email","tag-software","tag-spam","tag-websupport"],"yoast_head":"\nZbroj\u00edme na souboj se spamem (2. \u010d\u00e1st) - Websupport.cz Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.websupport.cz\/blog\/2015\/02\/zbrojime-na-souboj-se-spamem-2-cast\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Zbroj\u00edme na souboj se spamem (2. \u010d\u00e1st) - Websupport.cz Blog\" \/>\n<meta property=\"og:description\" content=\"Tento blog je pokra\u010dov\u00e1n\u00edm m\u00e9ho rok star\u00e9ho \u010dl\u00e1nku o tom, co d\u011bl\u00e1me v boji proti odchoz\u00edmu spamu. Za t\u011bch posledn\u00edch dvan\u00e1ct m\u011bs\u00edc\u016f jsme se zase po\u0159\u00e1dn\u011b posunuli.\u00a0Osobn\u011b si mysl\u00edm, \u017ee m\u00e1lokdo na Slovensku, a mo\u017en\u00e1 tak\u00e9 v \u010cesku, d\u011bl\u00e1 tak mnoho v boji proti spam\u016fm. 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