fix: accepted and bounced state on DATACLOSE failure

[Nolab0]

Close #400
close #362

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
worker/send.go	90.90%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[supun-io]

issue is not fixed:

reproduce with this (using missing+atdata):

curl -X POST https://relay.hyvor.localhost/api/console/sends      -H "Authorization: Bearer test-api-key"      -H "Content-Type: application/json"      -d '{
           "from": "test@hyvor.local.testing",
           "to": "missing+atdata@simulator.net",
           "subject": "Hello from Hyvor Relay",
           "body_text": "This is a test email sent via the API."
         }'

(make sure to upgrade simulator to the latest, 0.0.9)

[supun-io]

#426 (comment)

[supun-io]

please ignore the previous comment - it worked perfectly