Postfix is Still Sending out SPAM despite closing the Famous "Open Relay"
Fahad asked: Lets pretend for a second there , my client’s website is thatshowithappened.com A couple of weeks ago our server was an open relay , we fixed that. And …
Detect spammers on my server
mfuesslin asked: I recently got one Undelivered Mail Returned to Sender while sending my newsletter to one of my 1500 customers. My website uses a double-opt-in procedure to make sure, …
Significance of NOQUEUE: reject: RCPT in Postfix log?
Tyler Durden asked: I set up brand new Postfix server last night and did not configure at all yet, just did the install. So, I logged in this morning to …
Is it possible to require certain domains to come from certain IPs in postfix?
Wayne Werner asked: I’m running postfix 3.1 and I just got some email from 183.8.202.206 that said it came from gmail. A quick lookup shows that unless Google has been …
How to configure SPF to pass local IP address?
user46688 asked: I have a database CentOS 7 server connected to an application CentOS 7 server via a cross connect cable. The mail server resides in the application server, with …
Postfix, how can I reject spam from unknown IP (no DNS)
Alienizer asked: Despite all efforts to filter spam, I’m still getting spam from unknown even after I’ve set main.cf to not allow it and to check the DNS etc. Even …
Which DNS name is checked for TLS on a mailserver?
allo asked: Let’s say i have these records: A mail.somedomain: 127.0.0.1 A mail.mailserverdomain: 127.0.0.1 MX somedomain: mail.somedomain A MTA connects mail.somedomain for delivering mail to somedomain and gets a certificate …
Does FCRDNS need the RDNS to be the same hostname than the first forward query?
allo asked: Does forward confirmed reverse dns (fcrdns) only lookup ip to hostname and then hostname to ip or does it compare to the first hostname as well (especially in …
How to set postfix to just ignore mail to nonexistent users
OsakaWebbie asked: I’m getting a huge amount of spamming attempts to random usernames. I know that it happens to all mail servers to some degree, but during the last two …
Automated telephone call about sending spam mails
Yama asked: We just got a call from a US telephone number (001-, didn’t get the rest of it) with an automated voice, stating that someone had sent spam mails …