Good Question and Better and wise way is Use inside PSA/CSA genealogy mailer!
why?
coz it is safe and it inbox your email direct to your downlins/PSA/CSA or basically your Team
and also SFI mailers are recognize any email servers and they have good recommendation about sfi
mail coz we control spam complain and you can add only info about sfi only
so once you want to send emails it is good idea to use inside sfi mailer
