How to install and configure sendmail in ubuntu to send emails (you can also send them in php, you can also send anonymous emails)
1. Install sendmail
sudo apt install sendmail
2. Modify the /etc/hosts file and add the localhost.localdomain item (fully qualified domain name)
sudo vim /etc/hosts
Modified as follows:
127.0.0.1 localhost.localdomain localhost lenix-Swift-SF314-512
127.0.1.1 lenix-Swift-SF314-512
3. Modify the sendmail.mc configuration
cd /etc/mail
sudo vim sendmail.mc
Find the following 2 lines:
DAEMON_OPTIONS(`Family=inet, Name=MTA-v4, Port=smtp, Addr=127.0.0.1')dnl
DAEMON_OPTIONS(`Family=inet, Name=MSP-v4, Port=submission, M=Ea, Addr=127.0.0.1')dnl
Adding dnl in front means commenting out these 2 lines to enable external network access.
Modified as follows:
dnl DAEMON_OPTIONS(`Family=inet, …
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