BUG: routed emails not sent when ClamAV is enabled.

## Describe the bug
When clamav is enabled, I can send emails using the SMTP connector with an SMTP key, but when I try to reply to an email that was sent from the SMTP that try to use a route and an address endpoint, it cannot send the mail
the message is stuck in "Incoming Messages" with this error message

May 24, 2024 12:34
Error
An internal error occurred while sending this message. This message will be retried automatically.
TypeError: no implicit conversion of Array into String

## To Reproduce
1 clamav installed
2 postal.yml
clamav:
enabled: true
host: 127.0.0.1
port: 2000
3 postal restart
4 new email to route1@domain.com from your prefered email client application
5 mail comes in and stays stuck

## Expected behaviour

message should be sent to the route

## Screenshots


## Environment details

- OS: ubuntu 22.04 Lts
- Version Postal 3.3.3

## Additional information/context
same error mentionned here #2941