分類彙整：mail

建立 /etc/postfix/reject_user, 填入要封鎖的帳號資料, 建立該db檔. smtpd_recipient_restrictions = check_sender_access hash:/etc/postfix/reject_user, permit_mynetworks, permit_sasl_authenticated, reject_rbl_client cbl.abuseat.org, reject_rbl_client list.dsbl.org, reject_rbl_client sbl.spamhaus.org, reject_rbl_client pbl.spamhaus.org, reject_rbl_client bl.spamcop.net, reject_rbl_client cblless.anti-spam.org.cn, reject_rbl_client psbl.surriel.com, reject_rbl_client bl.spamcop.net, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_destination, reject_invalid_hostname, reject_non_fqdn_hostname, reject_non_fqdn_sender, reject_non_fqdn_recipient, smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/reject_user, permit_mynetworks, reject_unknown_client, reject_unknown_sender_domain, … 繼續閱讀 →

3個問題 1. Helo command rejected: need fully-qualified hostname A: relay_domains = 加入 mail.xxx.com 2.SASL CRAM-MD5 authentication failed: authentication failure A: 這個是 Client 那邊 密碼規則錯誤 3 .warning: SASL authentication problem: unable to open Berkeley db /etc/sasldb2: No such file or directory … 繼續閱讀 →

鳥哥新增 https://linux.vbird.org/events/email_spf_dkim_dmarc.php https://wiki.freedomstu.com/books/%E9%96%8B%E6%BA%90%E8%BB%9F%E9%AB%94%E5%AE%89%E8%A3%9D%E6%B5%81%E7%A8%8B/page/mailcow-dkim-spf-and-dmarc 測試驗證 https://mxtoolbox.com/SuperTool.aspx 申請dkim https://easydmarc.com/tools/dkim-record-generator 申請 dmarc https://dkimcore.org/tools/ bind9 _dmarc.example.com IN TXT "v=DMARC1; p=none; sp=none, rua=mailto:dmarc-reports@your.mail.server" 9999999.example._domainkey.example.tw. IN TXT ( "v=DKIM1;t=s;p=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" "xxxxxxxxxxxxxxxxxxxxxxxxxxx") 9999999.example._domainkey.example.tw.