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root@localhost
> The e-mail address is invalid
:thonkery:

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@CobaltVelvet I was annoyed about something at work doing this so I thought I'd quote the rfc at them but that's just confused me and made me think that it might not be valid.

tools.ietf.org/html/rfc5321#se

> A domain name that is not in FQDN form is no more than a local alias.
> Local aliases MUST NOT appear in any SMTP transaction.

However does delivering local mail count as an SMTP transaction? 🤷

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