Sender Score Low
Rocco The Taco asked: We host our own email server and have discovered we have a low sending score that is causing delivery issues. From the report (senderscore.org), there is …
What is meant by '550 Relay not Permitted' when it comes to emails?
Craig asked: For the past few months, I have been emailing a company with no problems. They have been able to receive my emails and they have been responding. A …
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 …