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http://www.postfix.org/OVERVIEW.html
Network mail enters Postfix via the smtpd(8) or qmqpd(8) servers. These servers remove the SMTP or QMQP protocol encapsulation, enforce some sanity checks to protect Postfix, and give the sender, recipients and message content to the cleanup(8) server.
http://www.postfix.org/STANDARD_CONFIGURATION_README.html
Disable spontaneous SMTP mail delivery (if using on-demand dialup IP only). Normally, Postfix attempts to deliver outbound mail at its convenience. If your machine uses on-demand dialup IP, this causes your system to place a telephone call whenever you submit new mail, and whenever Postfix retries to deliver delayed mail.
https://cloudmin.com/node/15463
Recently users have been reporting that mail randomly is not delivered from outside SMTP servers to internal accounts. What's strange with an issue I've tried to track down today, I can see Google's servers connection all the way through to the Postfix/Cleanup process.
https://www.rootusers.com/configure-postfix-to-forward-mail-to-a-central-relay-server/
relayhost = 192.168.0.25 – This tells postfix where the relay server is, this is where Postfix will forward mail to. local_transport=error: local delivery disabled – Local mail delivery is off as we are forwarding through a mail relay server.
https://support.plesk.com/hc/en-us/articles/213931945-Mail-to-external-mail-service-is-delivered-locally-on-Plesk-server
Go to Domains > example.com > Mail Settings > Uncheck Activate mail service on domain and click OK. Or disable mail service at the subscription level going to Subscriptions > example.com > Mail tab > Mail Settings tab > Select domains from the subscription > Click on Activate/Deactivate Services .
https://www.linode.com/docs/email/postfix/postfix-smtp-debian7/
Jan 29, 2019 · Configure Postfix to Send Mail Using an External SMTP Server Updated Thursday, October 31, 2019 by Linode Contributed by Santiago Ti Try this guide out by signing up for a Linode account with a $20 credit.
https://www.cyberciti.biz/faq/how-to-configure-postfix-relayhost-smarthost-to-send-email-using-an-external-smptd/
Aug 22, 2016 · H ow do I configure Postfix MTA to send eMail using an external cloud-based SMTP server (with username: password) from a web server on Linux or Unix-like system? How do I configure an Ubuntu server and postfix as the relay server (smarthost)? You can configuring Postfix MTA to use as a Smarthost i.e. routing all mails to a smarthost.
https://www.lisenet.com/2016/configure-rhel-7-to-forward-all-email-to-a-central-mail-server/
Configure Postfix as a Central Mail Server for a Domain To test email delivery, we can use a FreeIPA server that we set up some time ago, and configure it as a central mail server for our rhce.local domain.
https://www.golinuxcloud.com/configure-postfix-mail-server-smtp-relay-rhel/
Nov 18, 2019 · Postfix is a Mail Transport Agent (MTA) responsible for the transfer of e-mails between mail servers using the SMTP protocol. In this article I will share the steps to configure postfix mail server and client using postfix SMTP relay along with some examples to check SMTP server check configuration and connection in CentOS/RHEl 7/8 Linux.
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