mail server

Sendmail: Clear / Delete / Flush Mail Queue

by on July 1, 2011 · 7 comments

How can I permanently delete all e-mail messages in the Sendmail mail server (SMTP) queue using UNIX / Linux command prompt?

{ 7 comments }

Linux / UNIX: PHP mail() Error Log File

by on November 12, 2010 · 1 comment

How do I view PHP mail() errors? How do I see php mail() error log file under UNIX or Linux?

{ 1 comment }

Linux / UNIX: DNS Lookup Command

by on November 8, 2010 · 5 comments

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?

{ 5 comments }

Google Apps Domain Create SPF Records For BIND or Djbdns

by on October 19, 2010 · 3 comments

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?

{ 3 comments }

Start / Stop / Restart Postfix Mail Server

by on December 3, 2009 · 3 comments

How do I start / stop / restart my postfix mail server under Linux or UNIX operating systems?

{ 3 comments }

SPAMHAUS BLOCKLIST ADDRESS IS WRONG MUST FIX Error and Solution

by on May 7, 2009 · 1 comment

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?

{ 1 comment }

What Is The Difference Between Authentication And Authorization?

by on March 13, 2009 · 16 comments

What is the difference between authentication and authorization? Why it is important to understand difference between the two? Authentication vs. Authorization — what are they and how do they differ?

{ 16 comments }

← Previous Howtos