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Might be worth first checking your email preferences via logging into your email via a laptop / computer etc just to ensure they look right.
Also try a soft reboot by turning the phone Off and On.
And as a cure all type of method sometimes deleting the email credentials from the phone and re add the email address and password can help.
Are you using a pop3 or imap type of email account.
🌈 Stay Safe & Stay Alert. 🌈
Current Phone > Samsung Note 10+ 5G _256Gb > Model: SM-N976B.
Samsung One Ui 2.1 / Android 10.
Samsung Gear s3 Frontier Watch.
Samsung Galaxy Buds.