I went back to using mail (Default) and changed SPF record.

v=spf1 ip4:172.98.64.173 ip4:38.113.1.0/24 ip4:38.113.20.0/24 ip4:65.254.224.0/19 include:websitewelcome.com ~all

It corrected our delivery problem for GMAIL and Yahoo.

Used Grok for help.