Five ways in, and what each one is for.

Sending to the wrong one is the single biggest cause of a slow answer, so the table is the first thing on the page.

Contact channels, what each one is for, who answers, and the reply window.
ChannelWhat it is forWho answersWindow
[email protected]Plans, volume pricing, invoices and whether it fits what you already send.Sales1 business day
[email protected]Sending already and something is not arriving as the docs describe.Delivery team1 business day
github.com/arvo/issuesA bug in a client library you can reproduce.Whoever owns the file2–4 days, in public
github.com/arvo/discussions“Is this possible”, and “has anyone else hit this”.The room, sometimes usNo promise
[email protected]Anything exploitable. Do not open a public issue for these.On-call engineerSame day, weekends included

A small team answers all five. That is the reason every window above is a day and not an hour, and the reason the last row is different.