dot.msmtprc

defaults
port 587
tls on

account ${GMAIL_USER}
host smtp.gmail.com
tls_certcheck off
auth on
user ${GMAIL_USER}@gmail.com
from ${GMAIL_USER}@gmail.com
passwordeval gpg -q --for-your-eyes-only --no-tty -d ~/Maildir/${GMAIL_USER}.gpg

account ${GMAIL_USER2}
host smtp.gmail.com
tls_certcheck off
auth on
user ${GMAIL_USER2}@gmail.com
from ${GMAIL_USER2}@gmail.com
passwordeval gpg -q --for-your-eyes-only --no-tty -d ~/Maildir/${GMAIL_USER2}.gpg

account default : ${GMAIL_USER}