Google Compute Services VM and mailman
Bill R asked: I have a VM with Google running mailman 2.1.29 and it is rejecting inbound emails quoting the Google Compute Services name (new-xxxx.c.agile-being-nnnnnn.internal) and "Relay access denied". The …
Null Client Mail Server
Chr asked: I want to set up a null client mail server, i.e. a mail server that sends e-mails, but does not receive e-mails. I tried multiple guides relying on …
How do you use regex flags in postfix?
Altimus Prime asked: In Postfix we can apply some basic header, body, client checks using regex. I wanted to use flags. I added the following to the header_checks file: /some(\s|_|-)words(\s|_|-)here/gmi …
Prevent anyone from sending email between local users
user180685 asked: I’m trying to prevent anonymous users from potentially being able to send email from one local user to another. If someone knows the email addresses of 2 accounts …
postfix sasl authentication error in centos 7
ram khanal asked: Hello friends i am very new to linux server setup and maintenance field i am using centos 7 and i have given a task to setup postfix …
Postfix — mandatory TLS encryption not working for port 25 "relay sending"
71GA asked: On my Postfix server I use port 465 for submission, and port 25 for relay ("relay receiving" and "relay sending"). I use port 993 configured in Dovecot for …
Using "postfix" user for "dovecot"
71GA asked: I set the Postfix so that my mailboxes (maildir format) for my virtual users are set like this: ┌───┐ │ # │ root > myserver > ~ └─┬─┘ …
ec2 instance will not allow connections to port from within instance after opening port on security group
NotGaeL asked: I have an EC2 instance on a security group that allows ports 80, 443 and 22 (tcp, inbound from 0.0.0.0/0 and ::/0); and every outbound connection (to 0.0.0.0/0 …
Disable Postfix server TLS for specific clients
Adrien Clerc asked: I encountered troubles with some bad server trying to send me some emails that I desesparetely need. I can disable TLS globally using smtpd_tls_security_level, but it’s really …
Getting postfix to relay SMTP/SSL/TLS to Charter/Spectrum
Nstevens asked: I’m running Postfix on Debian as an MX for a small LAN and trying to get SMTPS working with mobile.charter.net over port 587. I followed a few links …