Setup SENDMAIL on Mac OSX Yosemite

sendmail_setup.md

SENDMAIL on MAC OSX Yosemite

http://www.garron.me/en/mac/postfix-relay-gmail-mac-os-x-local-smtp.html

1. Create a file to store our credentials:

sudo vim /etc/postfix/sasl_passwd

2. Add something like this:

smtp.gmail.com:587 username@gmail.com:password

3. Now run:

sudo postmap /etc/postfix/sasl_passwd

4. Prepare the postfix main config file:

sudo vim /etc/postfix/main.cf

5. Add/update these lines

    relayhost=smtp.gmail.com:587
    smtp_sasl_auth_enable=yes
    smtp_sasl_password_maps=hash:/etc/postfix/sasl_passwd
    smtp_use_tls=yes
    smtp_tls_security_level=encrypt
    tls_random_source=dev:/dev/urandom
    smtp_sasl_security_options = noanonymous
    smtp_always_send_ehlo = yes
    smtp_sasl_mechanism_filter = plain

6. Stop/Start the service

sudo postfix stop && sudo postfix start

7. Check the queue for any errors

mailq

Thanks for this - it was really helpful. Took a bit and eventually I got sendmail to work. For my ISP things didn't work until I added to /etc/postfix/main.cf - sendmail didn't want to connect using the resolved IPV6 addr.

net_protocols=ipv4

I also added this (not sure if this was needed -- the default value was loopback-only which looked suspicious).

inet_interfaces = all

For my google account I have 2FA enabled and needed an application specific password in /etc/postfix/sasl_passwd see https://support.google.com/accounts/answer/185833

Hope that helps someone else in getting this working.

Works :-) thanks

I also have the problem TLS is required, but our TLS engine is unavailable, then modify sudo vim /etc/postfix/main.cf change
smtp_tls_security_level=none,problem fix

I'm having issues with Xcode server bot sending emails. I get these logs:

kernel    Sandbox: sendmail(48548) deny(1) forbidden-exec-sugid
sendmail    fatal: execvp /usr/sbin/postdrop: Operation not permitted
sendmail    warning: command "/usr/sbin/postdrop -r" exited with status 1
sendmail    fatal: xcode@<redacted>.com(450): unable to execute /usr/sbin/postdrop -r: Undefined error: 0

Possibly a user issue? Anyone got any ideas?

@ddaddy have you tried this solution? Mail forwarding error in Plesk: unable to execute /usr/sbin/postdrop -r: Success 4.2.1 Message can not be delivered at this time

Yes. Unfortunately it seems on Big Sur it's not possible to amend the permissions chown: /usr/libexec/postfix: Operation not permitted as the root is now readonly.

After this setup I get the following error:
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
0B3D68C4939 1669 Mon Nov 28 11:31:59 imac2019@iMac-di-iMac.fritz.box
(Temporary lookup error)
ton@reurts.com
What setting have I done wrong?