{"id":76169,"date":"2020-03-31T13:42:34","date_gmt":"2020-03-31T11:42:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/kak-rabotaet-elektronnaya-pochta"},"modified":"2020-03-31T13:42:34","modified_gmt":"2020-03-31T11:42:34","slug":"kak-rabotaet-elektronnaya-pochta","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/kak-rabotaet-elektronnaya-pochta","title":{"rendered":"Como funciona o e-mail","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Este \u00e9 o come\u00e7o de um grande curso sobre como trabalhar com servidores de e-mail. N\u00e3o \u00e9 meu objetivo ensinar rapidamente algu\u00e9m a trabalhar com servidores de e-mail. Haver\u00e1 muita informa\u00e7\u00e3o adicional relacionada \u00e0s perguntas que encontraremos ao longo do caminho, porque estou tentando fazer o curso principalmente para aqueles que est\u00e3o apenas dando os primeiros passos. <\/p>\n<p><img decoding=\"async\" alt=\"Como funciona o e-mail\" src=\"\/wp-content\/uploads\/2020\/03\/4626a462456aaffbd0273fac45b49212.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Pref\u00e1cio<\/b>Acontece que trabalho como professor de administra\u00e7\u00e3o de Linux. Como tarefa de casa, dou aos alunos uma d\u00fazia de links para v\u00e1rios recursos, pois em alguns lugares a mat\u00e9ria \u00e9 insuficiente e em outros \u00e9 muito complexa. Al\u00e9m disso, o material \u00e9 frequentemente duplicado em diferentes recursos, e \u00e0s vezes diverge. A maioria do conte\u00fado est\u00e1 em ingl\u00eas, e alguns alunos enfrentam dificuldades de compreens\u00e3o. H\u00e1 \u00f3timos cursos de Semaev e Lebedev, e talvez de outros, mas, na minha opini\u00e3o, alguns t\u00f3picos n\u00e3o s\u00e3o suficientemente explorados, enquanto outros n\u00e3o est\u00e3o bem relacionados entre si.<\/p>\n<p>Portanto, um dia decidi resumir o material e oferec\u00ea-lo aos alunos de uma forma conveniente. Mas, j\u00e1 que estou fazendo isso, por que n\u00e3o compartilhar com todos? Primeiro, tentei fazer em formato de texto e adicionar links, mas existem milh\u00f5es de tais recursos, e qual \u00e9 o resultado? \u00c0s vezes, faltavam explica\u00e7\u00f5es visuais, outras vezes, os alunos se mostram relutantes em ler todo o texto (e n\u00e3o s\u00f3 eles), resultando em lacunas no conhecimento.<\/p>\n<p>Mas a quest\u00e3o n\u00e3o est\u00e1 apenas nos alunos. Durante toda a minha carreira, trabalhei com integradores de TI, o que me proporcionou uma enorme experi\u00eancia com diversos sistemas. Acabei me tornando um engenheiro com m\u00faltiplas habilidades. Frequentemente me deparo com profissionais de TI em v\u00e1rias empresas e percebo com bastante frequ\u00eancia lacunas no conhecimento deles. Na \u00e1rea de TI, muitos s\u00e3o autodidatas, eu tamb\u00e9m sou um deles. E eu tenho v\u00e1rias lacunas, e gostaria de ajudar os outros e a mim mesmo a elimin\u00e1-las.<\/p>\n<p>Na minha opini\u00e3o, v\u00eddeos curtos com informa\u00e7\u00f5es s\u00e3o mais interessantes e mais f\u00e1ceis de assimilar, por isso decidi experimentar esse formato. E eu sei que n\u00e3o sou o melhor orador, \u00e9 dif\u00edcil me ouvir, mas estou tentando melhorar. Para mim, isso \u00e9 um novo hobby que quero desenvolver. Antes, tinha um microfone pior, agora principalmente resolvo problemas com som e dic\u00e7\u00e3o. Quero criar conte\u00fado de qualidade e realmente preciso de cr\u00edticas e conselhos objetivos.<\/p>\n<p>P.S. Algumas pessoas acharam que o formato de v\u00eddeo n\u00e3o \u00e9 bem adequado e seria melhor usar texto. Eu n\u00e3o concordo completamente, mas que seja \u2014 tanto em v\u00eddeo quanto em texto. <\/p>\n<p><b class=\"spoiler_title\">V\u00eddeo<\/b><center><div class=\"youtube-placeholder\" data-id=\"dDb9j9UqK2E\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/dDb9j9UqK2E\/hqdefault.jpg\" alt=\"Por que no hosting comum a administra\u00e7\u00e3o do PrestaShop \u00e9 lenta, e no seu n\u00e3o \u00e9?\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<p>\nPr\u00f3ximo &gt; <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/494906\/\">Modos de opera\u00e7\u00e3o dos servidores de email<\/a><\/noindex><\/p>\n<p>Para poder trabalhar com e-mail, voc\u00ea precisa de um cliente de e-mail. Isso pode ser um cliente web, como Gmail, OWA, Roundcube, ou um aplicativo no computador \u2014 Outlook, Thunderbird, etc. Suponha que voc\u00ea j\u00e1 tenha se registrado em algum servi\u00e7o de e-mail e precise configurar o cliente de e-mail. Voc\u00ea abre o programa e ele solicita os dados: nome da conta, seu endere\u00e7o de e-mail e senha. <\/p>\n<p><img decoding=\"async\" alt=\"Como funciona o e-mail\" src=\"\/wp-content\/uploads\/2020\/03\/089c45f08398a7864f3a08d40ce41e3f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDepois de inserir esses dados, seu cliente de e-mail tentar\u00e1 encontrar informa\u00e7\u00f5es sobre seu servidor de e-mail. Isso \u00e9 feito para simplificar a configura\u00e7\u00e3o da conex\u00e3o com o servidor, uma vez que a maioria dos usu\u00e1rios n\u00e3o sabe os endere\u00e7os e protocolos de conex\u00e3o. Para isso, os clientes de e-mail utilizam diferentes m\u00e9todos para buscar informa\u00e7\u00f5es sobre o servidor e as configura\u00e7\u00f5es de conex\u00e3o. Esses m\u00e9todos podem variar de acordo com o cliente de e-mail. <\/p>\n<p><img decoding=\"async\" alt=\"Como funciona o e-mail\" src=\"\/wp-content\/uploads\/2020\/03\/fb3a21cb3ffe70327beabc187f371c99.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPor exemplo, o Outlook utiliza o m\u00e9todo 'autodiscover', em que o cliente consulta o servidor DNS e pergunta sobre um registro autodiscover associado ao dom\u00ednio de e-mail que voc\u00ea forneceu nas configura\u00e7\u00f5es do seu cliente de e-mail. Se o administrador configurou esse registro no servidor DNS, ele apontar\u00e1 para o servidor web.<\/p>\n<p><img decoding=\"async\" alt=\"Como funciona o e-mail\" src=\"\/wp-content\/uploads\/2020\/03\/1203a1a11bedc5fdf2b8dcdd3aee663b.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDepois que o cliente de e-mail descobre o endere\u00e7o do servidor web, ele o consulta e encontra um arquivo pr\u00e9-preparado com as configura\u00e7\u00f5es de conex\u00e3o ao servidor de e-mail no formato XML. <\/p>\n<p><img decoding=\"async\" alt=\"Como funciona o e-mail\" src=\"\/wp-content\/uploads\/2020\/03\/1581f07ab0c164fc3c29f61482a26a5f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNo caso do Thunderbird, o cliente de e-mail n\u00e3o faz a busca pelo registro DNS autodiscover, mas tenta se conectar diretamente ao servidor web autoconfig. e ao nome do dom\u00ednio especificado. E tamb\u00e9m tenta encontrar um arquivo com as configura\u00e7\u00f5es de conex\u00e3o no formato XML no servidor web. <\/p>\n<p><img decoding=\"async\" alt=\"Como funciona o e-mail\" src=\"\/wp-content\/uploads\/2020\/03\/c14e7bdd8916813cb5a5fe3bffc8db74.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSe o cliente de e-mail n\u00e3o encontrar o arquivo com as configura\u00e7\u00f5es necess\u00e1rias, ele tentar\u00e1 adivinhar as configura\u00e7\u00f5es entre as mais usadas. Por exemplo, se o dom\u00ednio se chama example.com, o servidor de e-mail verificar\u00e1 se existem servidores com os nomes imap.example.com e smtp.example.com. Se encontrar, registrar\u00e1 isso nas configura\u00e7\u00f5es. Caso o cliente de e-mail n\u00e3o consiga determinar o endere\u00e7o do servidor de e-mail, ele sugerir\u00e1 que o usu\u00e1rio insira os dados de conex\u00e3o manualmente. <\/p>\n<p><img decoding=\"async\" alt=\"Como funciona o e-mail\" src=\"\/wp-content\/uploads\/2020\/03\/88cf82a8d73b63756641f1da8dcb71ed.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEnt\u00e3o voc\u00ea ver\u00e1 2 campos para <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1473\">servidores<\/a> \u2014 endere\u00e7o do servidor de correio de entrada e endere\u00e7o do servidor de correio de sa\u00edda. Em geral, em pequenas organiza\u00e7\u00f5es, esses endere\u00e7os coincidem, mesmo que sejam indicados atrav\u00e9s de diferentes nomes DNS, enquanto em grandes empresas, pode haver servidores diferentes. Mas n\u00e3o importa se \u00e9 o mesmo servidor ou n\u00e3o \u2014 os servi\u00e7os por tr\u00e1s deles s\u00e3o diferentes. Uma das combina\u00e7\u00f5es de servi\u00e7os de correio mais populares \u00e9 Postfix &amp; Dovecot. Onde Postfix atua como o servidor de correio de sa\u00edda (MTA \u2014 agente de transfer\u00eancia de correio), e Dovecot como o servidor de correio de entrada (MDA \u2014 agente de entrega de correio). Pelo nome, pode-se deduzir que o Postfix \u00e9 usado para enviar correio, enquanto o Dovecot \u00e9 para receber correio no cliente de correio. Os pr\u00f3prios servidores de correio se comunicam entre si atrav\u00e9s do protocolo SMTP \u2014 ou seja, o Dovecot (MDA) \u00e9 necess\u00e1rio para os usu\u00e1rios. <\/p>\n<p><img decoding=\"async\" alt=\"Como funciona o e-mail\" src=\"\/wp-content\/uploads\/2020\/03\/deea1c6730f39a24d355806b5212996e.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSuponha que configuramos a conex\u00e3o com nosso servidor de correio. Vamos tentar enviar uma mensagem. Na mensagem, indicamos nosso endere\u00e7o e o endere\u00e7o do destinat\u00e1rio. Agora, para entregar a mensagem, seu cliente de correio enviar\u00e1 a mensagem ao seu servidor de correio de sa\u00edda. <\/p>\n<p><img decoding=\"async\" alt=\"Como funciona o e-mail\" src=\"\/wp-content\/uploads\/2020\/03\/9f0b7d58993b3de43d92329b1ce515ca.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nQuando seu servidor receber a mensagem, ele tentar\u00e1 descobrir a quem deve entregar esta mensagem. Seu servidor n\u00e3o pode saber de cor os endere\u00e7os de todos os servidores de correio, portanto, ele consulta o DNS para encontrar um registro MX especial \u2014 que aponta para o servidor de correio para esse dom\u00ednio. Esses registros podem diferir para diferentes subdom\u00ednios. <\/p>\n<p><img decoding=\"async\" alt=\"Como funciona o e-mail\" src=\"\/wp-content\/uploads\/2020\/03\/b4890c1489f2711899bd7680d9d46183.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDepois que ele descobre o endere\u00e7o do servidor do destinat\u00e1rio, ele envia sua mensagem por SMTP para esse endere\u00e7o, onde o servidor de correio (MTA) do destinat\u00e1rio aceitar\u00e1 a mensagem e a colocar\u00e1 em um diret\u00f3rio especial, que tamb\u00e9m \u00e9 verificado pelo servi\u00e7o respons\u00e1vel por entregar as mensagens aos clientes (MDA). <\/p>\n<p><img decoding=\"async\" alt=\"Como funciona o e-mail\" src=\"\/wp-content\/uploads\/2020\/03\/8ab07a77173f19331e46b15b133454ab.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nQuando, da pr\u00f3xima vez, o cliente de correio do destinat\u00e1rio perguntar ao servidor de correio de entrada se h\u00e1 novas mensagens, o MDA enviar\u00e1 sua mensagem. <\/p>\n<p>Mas como os servidores de correio operam na internet e qualquer pessoa pode se conectar a eles e enviar mensagens, al\u00e9m de serem amplamente utilizados por v\u00e1rias empresas para trocar dados importantes, isso se torna um alvo atraente para criminosos, especialmente para spammers. Portanto, nos servidores de correio modernos, existem muitas medidas adicionais para confirmar o remetente, verificar spam, etc. E muitos desses t\u00f3picos eu tentarei abordar nas pr\u00f3ximas partes.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/494788\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u042d\u0442\u043e \u043d\u0430\u0447\u0430\u043b\u043e \u0431\u043e\u043b\u044c\u0448\u043e\u0433\u043e \u043a\u0443\u0440\u0441\u0430 \u043f\u0440\u043e \u0440\u0430\u0431\u043e\u0442\u0443 \u043f\u043e\u0447\u0442\u043e\u0432\u044b\u0445 \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432. \u042f \u043d\u0435 \u043f\u0440\u0435\u0441\u043b\u0435\u0434\u0443\u044e \u0446\u0435\u043b\u0438 \u0431\u044b\u0441\u0442\u0440\u043e \u043d\u0430\u0443\u0447\u0438\u0442\u044c \u043a\u043e\u0433\u043e-\u0442\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0441 \u043f\u043e\u0447\u0442\u043e\u0432\u044b\u043c\u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c\u0438. \u0422\u0443\u0442 \u0431\u0443\u0434\u0435\u0442 \u043c\u043d\u043e\u0433\u043e \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438, \u043a\u0430\u0441\u0430\u044e\u0449\u0430\u044f\u0441\u044f \u0442\u0435\u0445 \u0432\u043e\u043f\u0440\u043e\u0441\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u044b \u0431\u0443\u0434\u0435\u043c \u0432\u0441\u0442\u0440\u0435\u0447\u0430\u0442\u044c \u043f\u043e \u043f\u0443\u0442\u0438, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u044f \u0441\u0442\u0430\u0440\u0430\u044e\u0441\u044c \u0434\u0435\u043b\u0430\u0442\u044c \u043a\u0443\u0440\u0441 \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0434\u043b\u044f \u0442\u0435\u0445, \u043a\u0442\u043e \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u0435\u043b\u0430\u0435\u0442 \u043f\u0435\u0440\u0432\u044b\u0435 \u0448\u0430\u0433\u0438. \u041f\u0440\u0435\u0434\u0438\u0441\u043b\u043e\u0432\u0438\u0435\u0422\u0430\u043a \u0443\u0436 \u0441\u043b\u043e\u0436\u0438\u043b\u043e\u0441\u044c, \u0447\u0442\u043e \u043f\u043e\u0434\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u044e \u043f\u0440\u0435\u043f\u043e\u0434\u0430\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u043f\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":76170,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-76169","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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