I always suggest using the Default Email transport method:
To ensure emails are sent to your members, you will want to notify the most popular email providers using their bulk email notification. This will whitelist your forum domain to ensure emails go to your members.
AOL
https://postmaster.aol.com/trouble-ticket
Google
https://support.google.com/mail/contact/bulk_send
Microsoft (hotmail and msn.com)
https://support.microsoft.com/en-us...fsmsbl3&locale=en-us&ccsid=636361241664007719
Yahoo
https://postmaster.verizonmedia.com/sender-request
To ensure emails are sent to your members, you will want to notify the most popular email providers using their bulk email notification. This will whitelist your forum domain to ensure emails go to your members.
AOL
https://postmaster.aol.com/trouble-ticket
https://support.google.com/mail/contact/bulk_send
Microsoft (hotmail and msn.com)
https://support.microsoft.com/en-us...fsmsbl3&locale=en-us&ccsid=636361241664007719
Yahoo
https://postmaster.verizonmedia.com/sender-request