[configure sendmail on ubuntu to enable sending email] configure sendmail in ubuntu #mail #ubuntu

install_and_configure_sendmail_in_ubuntu.sh

### RUN
apt install --no-install-recommends sendmail-bin mailutils

mkdir -m 700 /etc/mail/authinfo

### --- START
vim /etc/mail/authinfo/gmail-smtp-auth

## add this to file
AuthInfo: "U:root" "I:USER@gmail.com" "P:GMAIL_USER_PASSWORD"

### --- END

### RUN
makemap hash /etc/mail/authinfo/gmail-smtp-auth < /etc/mail/authinfo/gmail-smtp-auth

### START
vim /etc/mail/sendmail.mc

## add this to file

dnl # Default Mailer setup
define(`SMART_HOST',`[smtp.gmail.com]')dnl
define(`RELAY_MAILER_ARGS', `TCP $h 587')dnl
define(`ESMTP_MAILER_ARGS', `TCP $h 587')dnl
define(`confAUTH_OPTIONS', `A p')dnl
TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
FEATURE(`authinfo', `hash -o /etc/mail/authinfo/gmail-smtp-auth.db')dnl
MAILER_DEFINITIONS
MAILER(`local')dnl
MAILER(`smtp')dnl

### END


### Regenerate sendmail configuration

make -C /etc/mail


### Reload sendmail
/etc/init.d/sendmail reload


### test sendmail Gmail relay
echo "This is a test for sendmail gmail relay" | sendmail test-user@gmail.com


### thanks goes to https://kifarunix.com/configure-sendmail-to-use-gmail-relay-on-ubuntu-18-04-debian-10-9/