fix SMTP AuthMechanism to disable SASL Auth

[apsega]

When I want to disable SASL Auth, I'm setting environment variable of SMTP_AUTHMECHANISM, to "", but it doesn't work and defaults to plain, logs:

2023/06/08 09:50:06 [DEBUG] : SMTP - SASL Auth :
Mechanisms: plain
User:
Token:
Identity:
Trace:

/kind bug
/area outputs

[poiana]

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[poiana]

Welcome @apsega! It looks like this is your first PR to falcosecurity/falcosidekick 🎉

[Issif]

Hi,

Thank you for your PR, I already created a PR recently to change how the output send the emails, it allows to disable the auth by letting the setting empty.

#502

edit: I changed my PR to follow yours, no the value to disable is "none"

[apsega]

@Issif thanks! I'll close the PR then. Looking forward to cut the release.