Frequently Asked Questions About Linux / UNIX » mail server http://www.cyberciti.biz/faq Every answer asks a more beautiful question. Fri, 03 Feb 2012 22:38:32 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Sendmail: Clear / Delete / Flush Mail Queuehttp://www.cyberciti.biz/faq/linux-unix-bsd-clear-sendmail-queue/ http://www.cyberciti.biz/faq/linux-unix-bsd-clear-sendmail-queue/#comments Fri, 01 Jul 2011 21:50:55 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=10768 How can I permanently delete all e-mail messages in the Sendmail mail server (SMTP) queue using UNIX / Linux command prompt?]]> http://www.cyberciti.biz/faq/linux-unix-bsd-clear-sendmail-queue/feed/ 4 Linux / UNIX: PHP mail() Error Log Filehttp://www.cyberciti.biz/faq/php-mail-error-log/ http://www.cyberciti.biz/faq/php-mail-error-log/#comments Fri, 12 Nov 2010 20:58:55 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9326 How do I view PHP mail() errors? How do I see php mail() error log file under UNIX or Linux?]]> http://www.cyberciti.biz/faq/php-mail-error-log/feed/ 1 Linux / UNIX: DNS Lookup Commandhttp://www.cyberciti.biz/faq/unix-linux-dns-lookup-command/ http://www.cyberciti.biz/faq/unix-linux-dns-lookup-command/#comments Mon, 08 Nov 2010 20:29:45 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9234 How do I perform dns lookup under Linux or UNIX or OS X operating systems without using 3rd party web sites for troubleshooting DNS usage?]]> http://www.cyberciti.biz/faq/unix-linux-dns-lookup-command/feed/ 5 Google Apps Domain Create SPF Records For BIND or Djbdnshttp://www.cyberciti.biz/faq/bind-named-djbdns-google-apps-sender-policy-framework/ http://www.cyberciti.biz/faq/bind-named-djbdns-google-apps-sender-policy-framework/#comments Tue, 19 Oct 2010 18:06:24 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9051 I work for a small business and outsourced our email hosting to Google. However, I noticed that spammers are using our From: First Last to send their spam messages. All bounced messages come to our catch only account. How do I stop this? How do I validate our domain using SPF? How do I configure a SPF for Google Apps domain using BIND 9 or djbdns?]]> http://www.cyberciti.biz/faq/bind-named-djbdns-google-apps-sender-policy-framework/feed/ 3 Start / Stop / Restart Postfix Mail Serverhttp://www.cyberciti.biz/faq/linux-unix-start-stop-restart-postfix/ http://www.cyberciti.biz/faq/linux-unix-start-stop-restart-postfix/#comments Thu, 03 Dec 2009 18:47:17 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=9480 How do I start / stop / restart my postfix mail server under Linux or UNIX operating systems?]]> http://www.cyberciti.biz/faq/linux-unix-start-stop-restart-postfix/feed/ 2 SPAMHAUS BLOCKLIST ADDRESS IS WRONG MUST FIX Error and Solutionhttp://www.cyberciti.biz/faq/spamhaus-blocklist-address-is-wrong-must-fix/ http://www.cyberciti.biz/faq/spamhaus-blocklist-address-is-wrong-must-fix/#comments Thu, 07 May 2009 21:30:46 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=3749 I've configured RBL for my postfix based mail server and I'm getting an error that read as follows:

May 3 04:35:37 mx02 postfix/smtpd[10956]: NOQUEUE: reject: RCPT from ant251.neoplus.adsl.tpnet.pl[83.26.101.251]: 554 5.7.1 Service unavailable; Client host [83.26.101.251] blocked using xen.spamhaus.org; SPAMHAUS BLOCKLIST ADDRESS IS WRONG MUST FIX; from= to= proto=ESMTP helo=


How do I fix this problem?]]> http://www.cyberciti.biz/faq/spamhaus-blocklist-address-is-wrong-must-fix/feed/ 1 What is the difference between authentication and authorization?http://www.cyberciti.biz/faq/authentication-vs-authorization/ http://www.cyberciti.biz/faq/authentication-vs-authorization/#comments Fri, 13 Mar 2009 22:21:10 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=3466 What is the difference between authentication and authorization? Why it is important to understand difference between two?]]> http://www.cyberciti.biz/faq/authentication-vs-authorization/feed/ 6 Postfix Configure Multiple ISP Client SMTP Authenticationhttp://www.cyberciti.biz/faq/postfix-multiple-isp-accounts-smarthost-smtp-client/ http://www.cyberciti.biz/faq/postfix-multiple-isp-accounts-smarthost-smtp-client/#comments Fri, 13 Mar 2009 18:00:32 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=3447 How do I support multiple ISP accounts in the Postfix SMTP client (smarthost) for relaying email? For example:

[a] user1@isp1.com must be relay via smtp.isp1.com.
[b] user1@isp2.com must be relay via smtp.isp2.com.
[c] me@mycorp.com must relay all my default email via smtp.mycorp.com.
]]> http://www.cyberciti.biz/faq/postfix-multiple-isp-accounts-smarthost-smtp-client/feed/ 4 Postfix Configure Client SMTP Authentication ( Smarthost Authentication )http://www.cyberciti.biz/faq/postfix-smtp-authentication-for-mail-servers/ http://www.cyberciti.biz/faq/postfix-smtp-authentication-for-mail-servers/#comments Thu, 12 Mar 2009 14:00:22 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=3433 My ISP requires that mail from my dynamic IP to our small business email addresses uses their outgoing SMTP servers. This is probably done to reduce abuse and spam but now I'm not able to send email and local Postfix log file displays authentication failure message. How do I relay mail through my mail ISP servers using Postfix SMTP under Linux / UNIX like operating systems? ]]> http://www.cyberciti.biz/faq/postfix-smtp-authentication-for-mail-servers/feed/ 13 FreeBSD Install FuzzyOCR To Detect Image Spamhttp://www.cyberciti.biz/faq/install-fuzzyocr-for-spamassassin-on-freebsd/ http://www.cyberciti.biz/faq/install-fuzzyocr-for-spamassassin-on-freebsd/#comments Tue, 27 Jan 2009 19:37:43 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=3180 Q. How do I install FuzzyOcr plugin for SpamAssassin to detect unsolicited bulk mail (Spam) containing images as the main content for Postfix mail server?]]> http://www.cyberciti.biz/faq/install-fuzzyocr-for-spamassassin-on-freebsd/feed/ 3 cPanel: Update Exim Mail Serverhttp://www.cyberciti.biz/faq/cpanel-linux-update-to-latest-version-of-exim/ http://www.cyberciti.biz/faq/cpanel-linux-update-to-latest-version-of-exim/#comments Sat, 20 Dec 2008 06:29:10 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=2907 Q. I'm using Cpanel CentOS Linux server. How do I upgrade my exim mail server? How do I update to the latest version of exim under cPanel Sever?]]> http://www.cyberciti.biz/faq/cpanel-linux-update-to-latest-version-of-exim/feed/ 1 Exim Remove All messages From the Mail Queuehttp://www.cyberciti.biz/faq/exim-remove-all-messages-from-the-mail-queue/ http://www.cyberciti.biz/faq/exim-remove-all-messages-from-the-mail-queue/#comments Wed, 19 Nov 2008 09:45:54 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=2491 Question: I'm using Exim mail server under CentOS Linux. How do I remove all messages from the Exim mail queue using a shell prompt?]]> http://www.cyberciti.biz/faq/exim-remove-all-messages-from-the-mail-queue/feed/ 17 PHP Send Emailhttp://www.cyberciti.biz/faq/php-sending-email/ http://www.cyberciti.biz/faq/php-sending-email/#comments Mon, 20 Oct 2008 17:51:23 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=2170 Q. How do I send an email using PHP and Apache webserver under Linux / UNIX operating systems? How do I send email from a PHP Script?]]> http://www.cyberciti.biz/faq/php-sending-email/feed/ 8 DNS Name Resolutionhttp://www.cyberciti.biz/faq/dns-name-resolution/ http://www.cyberciti.biz/faq/dns-name-resolution/#comments Thu, 12 Jun 2008 13:13:29 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1112 http://www.cyberciti.biz/faq/dns-name-resolution/feed/ 3 Bind Postfix Mail Server To Localhost or Specific IP Address Onlyhttp://www.cyberciti.biz/faq/postfix-receive-mail-on-specific-network-interfaces/ http://www.cyberciti.biz/faq/postfix-receive-mail-on-specific-network-interfaces/#comments Tue, 10 Jun 2008 13:13:42 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1102 http://www.cyberciti.biz/faq/postfix-receive-mail-on-specific-network-interfaces/feed/ 2 Mail delivery: DNS: Service unavailable errorhttp://www.cyberciti.biz/faq/mail-delivery-dns-service-unavailable-error/ http://www.cyberciti.biz/faq/mail-delivery-dns-service-unavailable-error/#comments Tue, 04 Mar 2008 18:25:37 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=2644 Q. My mail delivery fails with DNS: Service unavailable error. How do I fix this error under Linux / UNIX operating systems?]]> http://www.cyberciti.biz/faq/mail-delivery-dns-service-unavailable-error/feed/ 0 Configure Postfix for DNS Blackhole Lists such as dsbl.org / spamhaus.org databasehttp://www.cyberciti.biz/faq/howto-configure-postfix-dnsrbls-under-linux-unix/ http://www.cyberciti.biz/faq/howto-configure-postfix-dnsrbls-under-linux-unix/#comments Tue, 16 Oct 2007 18:24:23 +0000 Vivek Gite http://www.cyberciti.biz/faq/howto-configure-postfix-dnsrbls-under-linux-unix/ http://www.cyberciti.biz/faq/howto-configure-postfix-dnsrbls-under-linux-unix/feed/ 4 Postfix block PDF or ZIP files attachmentshttp://www.cyberciti.biz/faq/howto-postfix-block-pdf-zip-file/ http://www.cyberciti.biz/faq/howto-postfix-block-pdf-zip-file/#comments Fri, 10 Aug 2007 11:11:18 +0000 Vivek Gite http://www.cyberciti.biz/faq/howto-postfix-block-pdf-zip-file/ http://www.cyberciti.biz/faq/howto-postfix-block-pdf-zip-file/feed/ 1 Howto: Linux Dovecot Secure IMAPS / POP3S SSL Server configurationhttp://www.cyberciti.biz/faq/unix-dovecot-ssl-tls-server-configuration/ http://www.cyberciti.biz/faq/unix-dovecot-ssl-tls-server-configuration/#comments Mon, 16 Jul 2007 18:20:42 +0000 Vivek Gite http://www.cyberciti.biz/faq/unix-dovecot-ssl-tls-server-configuration/ http://www.cyberciti.biz/faq/unix-dovecot-ssl-tls-server-configuration/feed/ 1 Postfix / smtpd : sql_select option missing auxpropfunc error no mechanism available error and solutionhttp://www.cyberciti.biz/faq/postfix-sql_select-option-missing-auxpropfunc-error/ http://www.cyberciti.biz/faq/postfix-sql_select-option-missing-auxpropfunc-error/#comments Mon, 11 Jun 2007 20:27:50 +0000 Vivek Gite http://www.cyberciti.biz/faq/postfix-sql_select-option-missing-auxpropfunc-error/ http://www.cyberciti.biz/faq/postfix-sql_select-option-missing-auxpropfunc-error/feed/ 4