[bug]: Newlines from SMTP error messages in log entries are not removed

[mjesuele]

What happened?

Some SMTP errors, like the one below, contain line breaks which are preserved in Stalwart's logs, causing a single log entry to spread over multiple lines in the logfile:

2024-05-08T00:09:01.870163Z  INFO delivery{id=173742629280816684 return_path="[email protected]" nrcpt=1 size=5644}:attempt{domain="nebius.co" attempt_number=0}: smtp::outbound::session: context="rcpt" event="rejected" rcpt="[email protected]" mx="smtp.google.com" reason=Code: 550, Enhanced code: 5.1.1, Message: The email account that you tried to reach does not exist. Please try
double-checking the recipient's email address for typos or
unnecessary spaces. For more information, go to
 https://support.google.com/mail/?p=NoSuchUser z20-20020a19f714000000b0051b5efe7ebcsi3719625lfe.394 - gsmtp

I expect each log entry to be contained in a single line in the logfile.

How can we reproduce the problem?

I can reproduce the problem by doing the following steps:

Take any sufficiently large log file with significant activity in it and you'll likely encounter several examples of this.

Version

v0.7.x

What database are you using?

PostgreSQL

What blob storage are you using?

PostgreSQL

Where is your directory located?

SQL

What operating system are you using?

Docker

Relevant log output

No response

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