haccks/postfix_mail_macosx.md

## postfix_mail_macosx.md

      
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              postfix_mail_macosx.md
            
          
    Setting up postfix on MacOS High Sierra

MacOS Sierra High comes with preinstalled postfix. Follow these steps to configure it on a local system:
1. Create a sasl_passwd file


sudo nano /etc/postfix/sasl_passwd

Add this to the file

smtp.gmail.com:587 EMAIL@gmail.com:PASSWORD
Replace EMAIL with your gmail username and replace PASSWORD with your gmail password.

Create a lookup table

sudo postmap /etc/postfix/sasl_passwd

2. Edit the main.cf file


Open postfix's main.cf

sudo nano /etc/postfix/main.cf

Edit these values if they are not set already

mail_owner = _postfix
setgid_group = _postdrop

Add these fields at the end of the file (I am choosing mtp.gmail.com as myrelayhost to send email from gmail account. You can choose any other SMTP relayhost)

#Gmail SMTP
relayhost=smtp.gmail.com:587
# Enable SASL authentication in the Postfix SMTP client.
smtp_sasl_auth_enable=yes
smtp_sasl_password_maps=hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options=noanonymous
smtp_sasl_mechanism_filter=plain
# Enable Transport Layer Security (TLS), i.e. SSL.
smtp_use_tls=yes
smtp_tls_security_level=encrypt
tls_random_source=dev:/dev/urandom
3. Enable less secure app access

If you are using gmail then you must have to enable less secure app access.
4. Set postfix to autorun on reboot


Disable SIP


Open /System/Library/LaunchDaemons/com.apple.postfix.master.plist


sudo nano /System/Library/LaunchDaemons/com.apple.postfix.master.plist

Remove these lines

<string>-e</string>
<string>60</string>
and add these lines
<key>KeepAlive</key>
<true/>

Reload and relaunch the deamon

sudo launchctl unload /System/Library/LaunchDaemons/com.apple.postfix.master.plist
sudo launchctl load /System/Library/LaunchDaemons/com.apple.postfix.master.plist

Enable SIP

5. Send mail

Test by sending a mail
echo "Postfix setting test" | mail -s "Hello Postfix" "EMAIL@HOST.com"
Replace EMAIL@HOST.com with the email id of recipent.
Some useful commands


mailq :                   Check mails in the queue and errors if mail not sent.
sudo postfix flush:       Flush the queue.
sudo postsuper -d ALL     Delete mails in the queue.
sudo rm /var/mail/$USER   Remove all mails from local host.
sudo postfix start        Start postfix mail system.
sudo  postfix stop        Stop postfix mail system.
sudo postfix reload       Reload postfix mail system.


References:


How to send emails from localhost.
Postfix auto start on Sierra for smtp relay.