Certificado<\/a> a fim de criptografar os dados.<\/p>\nCom uma pequena mudan\u00e7a no arquivo main.cf voc\u00ea pode ativar isto.<\/p>\n
Para isso, os certificados ca-certificados devem ser instalados no servidor. Para redhat e centos isto \u00e9 descrito no pacote ca-certificados
\nOs ficheiros agrupados podem ser encontrados aqui: \/etc\/pki\/ca-trust\/extracted\/pem\/tls-ca-bundle.pem at centos7 Voc\u00ea deve ter seu pr\u00f3prio certificado e salv\u00e1-lo em \/etc\/postfix\/postfix_default.pem junto com a chave e a crt raiz.<\/p>\n
Agora introduza estes comandos:<\/p>\n
\npostonf -e smtp_tls_security_level=may\npostonf -e smtp_tls_cert_file=\/etc\/postfix\/postfix_default.pem\npostonf -e smtp_tls_key_file=\/etc\/postfix\/postfix_default.pem\npostonf -e smtp_tls_CAfile = \/etc\/pki\/ca-trust\/extracted\/pem\/tls-ca-bundle.pem\npostonf -e smtp_tls_mandatory_exclude_ciphers='aNULL, DES, RC4, MD5'.\n\np\u00f3s-conf -e smtpd_tls_security_level=may\npostonf -e smtpd_tls_key_file=\/etc\/postfix\/postfix_default.pem\npostonf -e smtpd_tls_cert_file=\/etc\/postfix\/postfix_default.pem\np\u00f3s-conf -e smtpd_tls_mandatory_protocols='!SSLv2, !SSLv3'\npostonf -e smtpd_tls_protocols='!SSLv2, !SSLv3'\npostonf -e smtpd_tls_mandatory_ciphers=high\npostonf -e smtpd_tls_mandatory_exclude_ciphers='aNULL, DES, RC4, MD5'.\npostonf -e tls_high_cipherlist='EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH:+CAMELLLIA256:+AES256:+CAMELLLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!ECDSA:CAMELLLIA256-SHA:AES256-SHA:CAMELLLIA128-SHA:AES128-SHA'.\n<\/pre>\nA partir de agora, encripta a outros servidores que oferecem isto.<\/p>\n
Mas certifica-te que as op\u00e7\u00f5es: <\/p>\n
Esta op\u00e7\u00e3o \u00e9 anunciada por alguns provedores em comerciais de TV como uma entrega segura de e-mail. Note que isto \u00e9 apenas uma criptografia de transporte, ou seja, o caminho entre os dois servidores de e-mail. O e-mail em si \u00e9 novamente armazenado em texto simples no servidor de e-mail do destinat\u00e1rio.<\/p>","protected":false},"excerpt":{"rendered":"
Es ist immer sinnvoll die eMail Kommunikation zu verschl\u00fcsseln, gerade wenn man auch mobil unterwegs ist und in wlan Umgebungen eMails abruft oder schreibt. Denn hier lauert meist ein unbekannter, der die Kommunikation im Klartext mitschneidet. Mit simplen Einstellungen im eMailprogramm oder Smartphone kann man die Verschl\u00fcsselte Verbindung aktivieren. Somit ist die Verbindung vom eMailprogramm 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