I‘ve central e-mail server. Other servers does not need to operate as a mail server. How do I configure Sendmail as submission-only e-mail server (mail client) under CentOS / Fedora / RHEL / Debian Linux / UNIX like operating systems?
I‘ve multiple virtual domain hosted on CentOS Postfix server. How do I forward selected virtual domain email to yahoo / gmail or other email account using Postfix email server?
I‘ve central mail server gateway. All of our internal systems through this box. How do I remove or hide the hostnames and IP addresses of our internal systems from the messages headers before they go out to other users for security purpose?
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[126.96.36.199]: 554 5.7.1 Service unavailable; Client host [188.8.131.52] blocked using xen.spamhaus.org; SPAMHAUS BLOCKLIST ADDRESS IS WRONG MUST FIX; from=
to= proto=ESMTP helo=
How do I fix this problem?
I can send and receive mail using email@example.com, but system generated emails such as firstname.lastname@example.org bounce backup with an error:
May 1 03:14:52 mail postfix/smtp: 23CA4BD6B40: to=
, relay=none, delay=0.01, delays=0/0/0/0, dsn=5.4.6, status=bounced (mail for mail.example.com loops back to myself)
How do I fix this error?