I have sent and replied to many emails using iPhone's Mail app, specially replying to my latest sent message twice! But suddenly when I tried to reply to my latest sent message again, I did not found the sent folder at all!
This is an important work message/conversation which it totally lost beside many other sent emails!
The only change I remember is updating my iOS multiple times so I guess it is the reason.
I am using multiple emails on same iPhone Mail App:
1- The sent folder is missing for another two emails (POP/SMTP) (but I am not sure if I sent a messages from them before or not).
2- The sent folder beside all other folders like Junk, trash, and custom folders are still there for my Outlook.com and Gmail emails (POP/SMTP).
I am using iPhone x (iOS 13.1.2).
Any information is appreciated!