POP3 email account using outlook (BT Host)

Hi,

our mailbox is full.

Your mailbox can no longer send messages. Please reduce your mailbox size. Delete any items you don't need from your mailbox and empty your Deleted Items folder.

I started getting the above message saying my mail box was nearly fully so I naturally deleted several emails (inbox & sent) so many that I only have emails from 2019 and I have also deleted any email that is above 4000kb. Strangely I am receiving emails however whenever I try to send I get the below message.

The server response was: mailbox full; STOREDRV.Submission.Exception:QuotaExceededException.MapiExceptionQuotaExceeded; Failed to process message due to a permanent exception with message Cannot submit message. 0.35250:0A002285, 1.36674:0A000000, 1.61250:00000000, 1.45378:02000000, 1.44866:62340000, 1.36674:0E000000, 1.61250:00000000, 1.45378:67340000, 1.44866:F2000000, 16.55847:D5180000, 17.43559:0000000004020000000000000000000000000000, 20.52176:140FEC880900101043050000, 20.50032:140FEC887917000000000000, 0.35180:48050000, 255.23226:0A003485, 255.27962:0A000000, 255.27962:0E000000, 255.31418:0A006185, 0.35250:0A000000, 1.36674:0A000000, 1.61250:00000000, 1.45378:02000000, 1.44866:10000000, 1.36674:32000000, 1.61250:00000000, 1.45378:15000000, 1.44866:01000000, 16.55847:7C000000, 17.43559:0000000068030000000000000100000000000000, 20.52176:140FEC88090070200A009A85, 20.50032:140FEC88791710106B050000, 0.35180:0A009B85, 255.23226:4800D13D, 255.27962:0A000000, 255.27962:32000000, 255.17082:D9040000, 0.27745:75050000, 4.21921:D9040000, 255.27962:FA000000, 255.1494:7A050000, 0.38698:0F010480, 0.37692:01000001, 0.37948:00000000, 5.33852:00000000534D545000000100, 0.62316:0F010480, 5.29818:0000000032346637343431392D383462382D343433352D383836642D3631333164666161643036660037382D, 1.29920:02000000, 7.29828:96BE353D0000000000000000, 7.29832:0000C03C000000001A010480, 4.45884:D9040000, 4.29880:D9040000, 1.52492:02000000, 4.29888:D9040000, 7.40748:010000000000010C0F010480, 7.57132:000000000000000012000100, 1.63016:32000000, 4.39640:D9040000, 8.45434:1944F724B8843544886D6131DFAAD06F12000100, 5.10786:0000000031352E32302E323238342E3030373A564931505230374D42333136383A35613365303137302D623232342D343437382D613931662D61666433386534303161353700001000000000, 7.51330:8F1F42B5383DD70831333300, 255.1750:0A001C86, 255.31418:0A00F565, 0.22753:C5050000, 255.21817:D9040000, 4.60547:D9040000, 0.21966:CA050000, 4.30158:D9040000 [Hostname=VI1PR07MB3168.eurprd07.prod.outlook.com]

Any ideas!

Thanks in advance.

Rich