{"id":64269,"date":"2020-09-24T15:37:25","date_gmt":"2020-09-24T13:37:25","guid":{"rendered":"https:\/\/blog.mailfence.com\/estrategia-aplicacao-mailfence-dmarc\/"},"modified":"2024-11-14T10:53:56","modified_gmt":"2024-11-14T09:53:56","slug":"estrategia-aplicacao-mailfence-dmarc","status":"publish","type":"post","link":"https:\/\/blog.mailfence.com\/pt\/estrategia-aplicacao-mailfence-dmarc\/","title":{"rendered":"Estrat\u00e9gia de aplica\u00e7\u00e3o Mailfence DMARC"},"content":{"rendered":"\n
\"Estrategia<\/figure>\n\n\n\n


Tomamos v\u00e1rias medidas para proteger nossos usu\u00e1rios de ataques comuns, como spoofing ou phishing<\/a>. No entanto, esses e-mails ainda podem chegar \u00e0 sua caixa de entrada. Embora tenhamos prote\u00e7\u00f5es<\/a> convencionais<\/a> e outras<\/a> medidas em vigor<\/a>, \u00e0s vezes elas ficam aqu\u00e9m. Portanto, decidimos aplicar a pol\u00edtica DMARC dos remetentes, em car\u00e1ter experimental. Leia mais sobre a estrat\u00e9gia de aplica\u00e7\u00e3o do Mailfence DMARC abaixo.<\/p>\n\n\n\n

O que \u00e9 DMARC?<\/h2>\n\n\n\n

DMARC significa “Domain-based Message Authentication, Reporting & Conformance”. Ele permite que os remetentes definam para seu dom\u00ednio por uma pol\u00edtica sobre o que o destinat\u00e1rio deve fazer quando o SPF e ou DKIM falhar. O DMARC tamb\u00e9m verifica<\/a> se o campo Cabe\u00e7alho-FROM das mensagens est\u00e1 alinhado com as verifica\u00e7\u00f5es SPF e DKIM. Os propriet\u00e1rios de dom\u00ednio tamb\u00e9m podem receber relat\u00f3rios agregados e ou forenses do servi\u00e7o receptor, essencialmente listando um resumo dos resultados DMARC de seu dom\u00ednio. Isso permite que os propriet\u00e1rios de dom\u00ednio fa\u00e7am as altera\u00e7\u00f5es necess\u00e1rias para passar remetentes leg\u00edtimos ou ver de onde os e-mails maliciosos podem estar vindo.<\/p>\n\n\n\n

Quando o DMARC falha, com base na pol\u00edtica de dom\u00ednio de envio, a mensagem \u00e9 colocada em quarentena na sua pasta de spam ou rejeitada. Quando o DMARC \u00e9 aplicado pelo receptor, os usu\u00e1rios podem ser protegidos contra phishing, spoofing e outros tipos de e-mails indesejados.<\/p>\n\n\n\n

Mailfence agora imp\u00f5e pol\u00edtica DMARC de remetentes<\/h2>\n\n\n\n

Para garantir que os usu\u00e1rios do Mailfence tamb\u00e9m possam utilizar, entre outros, os benef\u00edcios anti-personifica\u00e7\u00e3o e anti-phishing do DMARC, decidimos come\u00e7ar a aplicar a pol\u00edtica DMARC dos remetentes.<\/p>\n\n\n\n

Por que o Mailfence n\u00e3o aplicava o DMARC antes?<\/h3>\n\n\n\n

Existem v\u00e1rias raz\u00f5es. Em primeiro lugar, a ado\u00e7\u00e3o da pol\u00edtica DMARC (juntamente com as verifica\u00e7\u00f5es SPF e DKIM) foi lenta. Em segundo lugar, um grande n\u00famero de dom\u00ednios optou pelo modo de monitoramento (p = nenhum) e n\u00e3o mudou para uma pol\u00edtica DMARC acion\u00e1vel. Em terceiro lugar, para evitar a perda de e-mails leg\u00edtimos com falha no DMARC devido a um erro de implementa\u00e7\u00e3o no envio ou vindo de uma lista de e-mails.<\/p>\n\n\n\n

O que exatamente acontecer\u00e1 com os e-mails que recebo?<\/h4>\n\n\n\n

Se a verifica\u00e7\u00e3o DMARC falhar, o e-mail ser\u00e1 colocado em sua pasta de spam se a pol\u00edtica de envio de dom\u00ednio for ‘quarentena’. Da mesma forma, se a pol\u00edtica de envio de dom\u00ednio for ‘rejeitar’, o e-mail com falha no DMARC ser\u00e1 recusado.<\/p>\n\n\n\n

Esta aplica\u00e7\u00e3o \u00e9 permanente?<\/h4>\n\n\n\n

Entendemos perfeitamente que isso pode resultar na perda de e-mails leg\u00edtimos em casos espec\u00edficos. Portanto, decidimos aplicar nossa decis\u00e3o de aplica\u00e7\u00e3o do DMARC em car\u00e1ter experimental. Isso nos permitir\u00e1 adotar nossa estrat\u00e9gia, se necess\u00e1rio.<\/p>\n\n\n\n

A lista de permiss\u00f5es afeta a decis\u00e3o do DMARC?<\/h4>\n\n\n\n

N\u00e3o. Ativar a op\u00e7\u00e3o de lista de permiss\u00f5es em suas configura\u00e7\u00f5es atualmente n\u00e3o tem efeito sobre as a\u00e7\u00f5es de quarentena \/ rejei\u00e7\u00e3o realizadas pela verifica\u00e7\u00e3o de pol\u00edtica DMARC (ou seja, DMARC \u00e9 atualmente uma verifica\u00e7\u00e3o de “todo o sistema”).<\/p>\n\n\n\n

Pol\u00edtica DMARC da Mailfence<\/h2>\n\n\n\n

Mailfence definiu sua pr\u00f3pria pol\u00edtica DMARC como ‘quarentena’. Isso significa que, se a verifica\u00e7\u00e3o do DMARC falhar, os servidores de e-mail do destinat\u00e1rio devem colocar o e-mail na pasta de spam do destinat\u00e1rio. Isso reduz phishing, spoofing ou outras formas de ataques de falsifica\u00e7\u00e3o de identidade. Da mesma forma, tamb\u00e9m contribui para manter a reputa\u00e7\u00e3o de nosso nome de dom\u00ednio.<\/p>\n\n\n\n

Poder\u00edamos ter definido a pol\u00edtica como ‘rejeitar’. No entanto, isso pode afetar negativamente a entrega de e-mails leg\u00edtimos. Por exemplo, uma mensagem pode falhar no DMARC se for enviada a uma lista de e-mails que a retransmita a todos os participantes. Isso pode mudar no futuro, com a ado\u00e7\u00e3o do suporte DMARC e DKIM<\/a>, junto com o ARC<\/a>.<\/p>\n\n\n\n

Os propriet\u00e1rios de dom\u00ednios personalizados<\/a> tamb\u00e9m s\u00e3o incentivados a definir a pol\u00edtica DMARC para seus dom\u00ednios.<\/p>\n\n\n\n

Sinta-se \u00e0 vontade para compartilhar seus coment\u00e1rios e relatar qualquer problema relacionado \u00e0 estrat\u00e9gia de aplica\u00e7\u00e3o do Mailfence DMARC.<\/p>\n\n\n\n

N\u00f3s agradecemos por seu apoio. Acesse a nossa p\u00e1gina de imprensa<\/a> para saber mais sobre a Mailfence.<\/p>\n\n\n\n

Siga-nos no twitter\/<\/a>reddit <\/a>para se manter atualizado o tempo todo.<\/p>\n\n\n\n

– Equipe Mailfence <\/p>\n","protected":false},"excerpt":{"rendered":"

Tomamos v\u00e1rias medidas para proteger nossos usu\u00e1rios de ataques comuns, como spoofing ou phishing. No entanto, esses e-mails ainda podem chegar \u00e0 sua caixa de entrada. Embora tenhamos prote\u00e7\u00f5es convencionais e outras medidas em vigor, \u00e0s vezes elas ficam aqu\u00e9m. Portanto, decidimos aplicar a pol\u00edtica DMARC dos remetentes, em car\u00e1ter experimental. 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