Certifikat<\/a> til at kontrollere, om dataene skal krypteres.<\/p>\nMed en lille \u00e6ndring i filen main.cf kan du aktivere dette med en lille \u00e6ndring i filen main.cf.<\/p>\n
For at dette kan lade sig g\u00f8re, skal ca-certifikaterne v\u00e6re installeret p\u00e5 serveren. For redhat eller centos findes dette i pakken ca-certificates
\nDe bundtede filer findes her: \/etc\/pki\/ca-trust\/extracted\/pem\/tls-ca-bundle.pem p\u00e5 centos7. Du b\u00f8r have dit eget certifikat og gemme det i \/etc\/postfix\/postfix_default.pem sammen med n\u00f8glen og root crt.<\/p>\n
Indtast nu disse kommandoer:<\/p>\n
\npostconf -e smtp_tls_security_level=may\npostconf -e smtp_tls_cert_file=\/etc\/postfix\/postfix\/postfix_default.pem\npostconf -e smtp_tls_key_file=\/etc\/postfix\/postfix\/postfix_default.pem\npostconf -e smtp_tls_CAfile = \/etc\/pki\/ca-trust\/extracted\/pem\/tls-ca-bundle.pem\npostconf -e smtp_tls_mandatory_exclude_ciphers='aNULL, DES, RC4, MD5'\n\npostconf -e smtpd_tls_security_level=may\npostconf -e smtpd_tls_key_file=\/etc\/postfix\/postfix\/postfix_default.pem\npostconf -e smtpd_tls_cert_file=\/etc\/postfix\/postfix\/postfix_default.pem\npostconf -e smtpd_tls_mandatory_protocols='!SSLv2, !SSLv3'\npostconf -e smtpd_tls_protocols='!SSLv2, !SSLv3'\npostconf -e smtpd_tls_mandatory_ciphers=high\npostconf -e smtpd_tls_mandatory_exclude_ciphers='aNULL, DES, RC4, MD5'\npostconf -e tls_high_cipherlist='EDH+CAMELLIA:EDH+aRSA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH:+CAMELLIA256:+AES256:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!ECDSA:CAMELLIA256-SHA:AES256-SHA:CAMELLIA128-SHA:AES128-SHA'\n<\/pre>\nFra nu af krypterer postfix til andre servere, der tilbyder dette.<\/p>\n
S\u00f8rg dog for, at indstillingerne: <\/p>\n
Nogle udbydere reklamerer i tv-reklamer for denne mulighed som en sikker e-mail-forsendelse. Bem\u00e6rk, at det naturligvis kun er en transportkryptering, alts\u00e5 stien mellem de to e-mail-servere. Selve e-mailen gemmes igen i almindelig tekst p\u00e5 modtagerens e-mail-server.<\/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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