How can I permanently delete all e-mail messages in the Sendmail mail server (SMTP) queue using UNIX / Linux command prompt?
I work for a small business and outsourced our email hosting to Google. However, I noticed that spammers are using our From: First Last
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[22.214.171.124]: 554 5.7.1 Service unavailable; Client host [126.96.36.199] 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?