{"id":4175,"date":"2020-10-30T20:02:00","date_gmt":"2020-10-30T19:02:00","guid":{"rendered":"https:\/\/webhosting.de\/postfix-certificate-verification-failed-for-gmail-smtp-in-l-google-com\/"},"modified":"2021-07-15T13:06:04","modified_gmt":"2021-07-15T12:06:04","slug":"postfix-certificaat-verificatie-failed-voor-mail-smtp-in-l-google-com","status":"publish","type":"post","link":"https:\/\/webhosting.de\/nl\/postfix-certificate-verification-failed-for-gmail-smtp-in-l-google-com\/","title":{"rendered":"postfix: uitgaand eMails gecodeerd"},"content":{"rendered":"<p>Het is altijd zinvol om e-mailcommunicatie te versleutelen, vooral wanneer u onderweg bent en e-mails in WLAN-omgevingen opent of schrijft. Omdat hier meestal een onbekende op de loer ligt, die de communicatie in platte tekst vastlegt.<\/p>\n<p>Met eenvoudige instellingen in het e-mailprogramma of de smartphone kunt u de gecodeerde verbinding activeren. De verbinding van het e-mailprogramma met de e-mailserver is dus versleuteld en veilig.<\/p>\n<p>De verbindingen tussen de mailservers van de afzender en de ontvanger zijn dan echter problematisch. Deze worden meestal onversleuteld verzonden, omdat het gaat om servers in een beveiligde omgeving. Natuurlijk is het dan mogelijk om het e-mailverkeer te kopi\u00ebren en af te luisteren.<\/p>\n<p>Je moet je <a href=\"https:\/\/webhosting.de\/nl\/srs-mit-postfix-unter-centos\/\">Postfix<\/a> mailservers geven in ieder geval de mogelijkheid om de <a href=\"https:\/\/webhosting.de\/nl\/personenbezogene-daten-sozialen-netzwerken\/\">Gegevens<\/a> indien mogelijk gecodeerd.<\/p>\n<p>Als je vermeldingen vindt in je maillot zoals:<\/p>\n<h2>certificaatverificatie mislukt voor gmail-smtp-in.l.google.com<\/h2>\n<p>Dan is je Postfix niet in staat om <a href=\"https:\/\/webhosting.de\/nl\/plesk-letsencrypt-zertifikat-erstellen\/\">Certificaat<\/a> om de gegevens te versleutelen.<\/p>\n<p>Met een kleine wijziging in het main.cf bestand kunt u dit activeren.<\/p>\n<p>Hiervoor moeten de ca-certificaten op de server worden ge\u00efnstalleerd. Voor redhat en centos wordt dit beschreven in de verpakking ca-certificaten<br \/>\nDe gebundelde bestanden zijn hier te vinden: \/etc\/pki\/ca-trust\/extracted\/pem\/tls-ca-bundle.pem bij centos7 U moet uw eigen certificaat hebben en het opslaan in \/etc\/postfix\/postfix_default.pem samen met de sleutel en de root crt.<\/p>\n<p>Voer nu deze commando's in:<\/p>\n<pre class=\"lang:sh decode:true\" >\npostconf -e smtp_tls_security_level=mag\npostconf -e smtp_tls_cert_file=\/etc\/postfix\/postfix_default.pem\npostconf -e smtp_tls_key_file=\/etc\/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=mag\npostconf -e smtpd_tls_key_file=\/etc\/postfix\/postfix_default.pem\npostconf -e smtpd_tls_cert_file=\/etc\/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:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH:+CAMELLIA256:+AES256:+CAMELLIA128:+AES128:+SSLv3:!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n<\/pre>\n<p>Van nu af aan postfixen naar andere servers die dit aanbieden.<\/p>\n<p>Maar zorg ervoor dat de opties: <\/p>\n<p>Deze optie wordt door sommige aanbieders in tv-commercials geadverteerd als een veilige e-maillevering. Houd er rekening mee dat dit natuurlijk slechts een transportversleuteling is, d.w.z. het pad tussen de twee mailservers. De e-mail zelf wordt weer in platte tekst op de e-mailserver van de ontvanger opgeslagen.<\/p>","protected":false},"excerpt":{"rendered":"<p>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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