Servidores de Email
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Transcript of Servidores de Email
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Introducao aos Servicos de Email
Felipe Natale Munhoz
SENAC TI - Redes de Computadores - Florianopolis/SC
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Primeira mensagemenviada entre dois computadores conectados por uma
rede.
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29 de outubro de 1969
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LO
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LO = FailLOGIN
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643 kilometros
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ARPANET
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Transmissao de pacotes jaexistia ha 40 anos
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Nesta epoca a entrega deemails era relativamente
simples
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E criado nos anos 1980 o Sendmail
Poderoso e Flexıvel
Rapidamente se tornou o servidor de email dominante noUnix.
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Componentes de um servico de Email
MUA - Mail User AgentMDA - Mail Delivery AgentMTA - Mail Transfer Agent
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Mail User Agent
Mais conhecido como cliente de email, o MUA permite queum usuario acesse uma ou mais contas de emailarmazenadas em um storage.
Exemplos
Microsoft Outlook
Thunderbird
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Mail Delivery Agent
E o componente que permite que um cliente de email acesseou faca download das mensagens armazenadas em umamailbox a qualquer momento.
Exemplos
Courier
Dovecot
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Mail Transfer Agent
E o componente que realiza a transmissao dos emails desdea origem ate o destino, podendo passar por diversos MTA’sate chegar ao destino.
ExemplosSendMail
Postfix
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Caracterısticas dos Servicos de Email
O sistema deve fornecer meios de garantir a independenciade falhas
Nao deve exigir que o computador do destinatario estejaonline.
Deve possibilitar a entrega de mensagens postergadas.
Deve possuir um esquema de spool de mensagens.
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SMTP
O padrao Internet para correio-eletronico e um protocolosimples, orientado a textos e projetado para transferirmensagens de maneira confiavel e eficiente, chamado SMTP(Simple Mail Transfer Protocol).
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