Postfix transport map always using catchall definition
user203913 asked: Hoping one of the Postfix experts on here can help me debug an issue I am having with transport maps. I’ve gone through a the recommend list of …
Received-SPF: neutral
Ed H. asked: When I send emails from my application I am getting a spf neutral error. I have been working with Google and my hosting company, but none of …
Why are emails sent to root redirected to nobody?
scrapy asked: $ uname -a Linux xxxx 4.9.0-4-amd64 #1 SMP Debian 4.9.51-1 (2017-09-28) x86_64 GNU/Linux $ cat /etc/aliases # See man 5 aliases for format postmaster: root root: [email protected] email …
Email not working correctly after DNS update
Tom asked: I have my domains at name.com where they are pointing to cloudflare DNS name servers. After changing webhost I have changed my server IP address at CloudFlare. My …
attack from China on the mail server
Emilio Galarraga asked: What is the best way to avoid this kind of attack on the mail server? Mar 22 21:47:46 mail dovecot: imap-login: Disconnected (auth failed, 1 attempts in …
PTR record/rDNS for mail server considered "generic" or a "dynamic IP"
Sefam asked: I’m currently trying to figure out how to configure my rDNS to be SpamAssassin friendly. SpamAssassin’s documentation only seems to provide the following; https://wiki.apache.org/spamassassin/Rules/CK_HELO_DYNAMIC_SPLIT_IP “The HELO appeared to …
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 …
What's the point of repeating an email address in "The Envelope" and the "The Header"?
TLDR asked: I learned that both the FROM address and the TO address is repeated in a hidden element called the “envelope”, and then repeated again in the “body”. Question …
Ubuntu Postfix: Mail loops back to myself and host greeted me with my own hostname
NeonNuke asked: my main.cf: smtpd_banner = $myhostname ESMTP biff = no append_dot_mydomain = no readme_directory = no smtpd_use_tls = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, …
Bypass Postfix 'reject_unknown_client_hostname' for authenticated SMTP clients
tcdaly asked: In my postfix configuration, I’ve switched on smtpd_client_restrictions = reject_unknown_client_hostname as an anti-spam measure. However, sometimes I fall foul of this myself when I make an authenticated SMTP …