How do I view PHP mail() errors? How do I see php mail() error log file under UNIX or Linux?
ow do I perform dns lookup under Linux or UNIX or Apple OS X operating systems without using 3rd party web sites for troubleshooting DNS usage?
How do I start / stop / restart my postfix mail server under Linux or UNIX operating systems?
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: NOQUEUE: reject: RCPT from ant251.neoplus.adsl.tpnet.pl[220.127.116.11]: 554 5.7.1 Service unavailable; Client host [18.104.22.168] blocked using xen.spamhaus.org; SPAMHAUS BLOCKLIST ADDRESS IS WRONG MUST FIX; from= to= proto=ESMTP helo=
How do I fix this problem?
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?