## sent
set sendmail="/usr/bin/msmtp"
set use_from=yes
set realname="My Name"
set from=my@gmail.com
set hostname="gmail.com"
set ssl_force_tls=yes
set imap_pass=$my_pass
unset ssl_starttls

defaults
tls on
port 587

[...]

account gmail
tls_fingerprint 39:7C:59:20:DE:55:51:F4:8B:72:1D:B5:B2:26:8A:D1:DB:90:C6:28:80:77:F9:B5:EC:C1:BF:1C:6F:4D:A1:63
from my@gmail.com
host smtp.gmail.com
auth on
user my@gmail.com
passwordeval gpg2 --no-tty -q -d ~/mygmail.gpg