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https://www.linuxtopia.org/online_books/mail_systems/postfix_documentation/STANDARD_CONFIGURATION_README_004.html
The idea is to set up a Postfix email firewall/gateway that forwards mail for "example.com" to an inside gateway machine but rejects mail for "anything.example.com". ... , only address literals matching $ inet_interfaces or $ proxy_interfaces are deemed local ... This avoids the need to specify firewall IP addresses into Postfix configuration ...
https://www.noip.com/support/knowledgebase/configure-postfix-work-alternate-port-smtp/
Configuring Postfix. Once you have installed Postfix you will need to start configuring the service. The following steps MUST be taken in order to send outbound mail using No-IP’s Alternate Port SMTP service with Postfix. Once you have completed installing Postfix you will need to modify the “main.cf” file.
https://serverfault.com/questions/432455/disable-postfix-tls-support-for-specific-destination-server
disable Postfix TLS support for specific destination server. Ask Question Asked 7 years, 3 months ago. ... a hostname or IP enclosed in square brackets is not resolved to an MX; ... WHat happens when you use the IP literal ? – adaptr Sep 28 '12 at 14:09. add a comment
https://forums.cpanel.net/threads/email-domain-literals.20373/
Jun 28, 2018 · Can anyone suggest a way of clearing up this annoying issue when running my domains through tests at dnsreport.com? WARN: One or more of your mailservers does not accept mail in the domain literal format ([email protected][0.0.0.0]).Mailservers are technically required RFC1123 5.2.17 to accept mail to domain literals for any of its IP addresses.
http://www.postfix.org/STANDARD_CONFIGURATION_README.html
Postfix Standard Configuration Examples. ... This avoids the need to specify firewall IP addresses into Postfix configuration files. The last part of the solution does the email forwarding, which is the real purpose of the firewall email function. ... 6a # Postfix 2.10 and later support separate relay control and 7a # spam control.
https://unix.stackexchange.com/questions/245158/what-is-the-correct-helo-for-a-smtp-server-that-does-not-receive-mail-and-does-n
Using postfix (on Ubuntu 16.04.3), I was receiving the access denied message in the postfix log at /var/log/mail.log: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) (in reply to MAIL FROM command) To try to get it working I added an FQDN entry for my host in …
http://www.postfix.org/IPV6_README.html
Postfix 2.2 introduces support for the IPv6 (IP version 6) protocol. IPv6 support for older Postfix versions was available as an add-on patch. The section "Compatibility with Postfix <2.2 IPv6 support" below discusses the differences between these implementations.
https://stackoverflow.com/questions/25605777/c-literal-suffix-u-ul-problems
A decimal number like -1,1,2,12345678, etc. without any suffix will get the smallest type it will fit, starting with int, long, long long.. An octal or hex number like 0, 0123, 0x123, 0X123 without any suffix will get the smallest type it will fit, starting with int, unsigned, long, unsigned long, long long, unsigned long long.
https://tldp.org/HOWTO/Spam-Filtering-for-MX/smtpchecks.html
The only use of use of IP literals I have come across is from mail user agents on my local area network, such as Ximian Evolution, configured to use my server as outgoing SMTP server (smarthost). ... This is a mechanism that is offered by some MTAs, such as Exim and Postfix, ... Among major MTAs, Exim and Postfix support this mechanism.
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