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I'm looking for an email (outgoing only) provider that has an API. I'd be sending probably ~100 a month, maybe. The reason is because microcontrollers have a hard time with TLS and whatnot, but CURLing to an API isn't that big of a deal.

I know sendgrid offers something like this as a freemium service, but free services sometimes don't work well. Is there a service that has a very limited, cheap plan but would still offer some support if needed?

I'm looking for an email (outgoing only) provider that has an API. I'd be sending probably ~100 a month, maybe. The reason is because microcontrollers have a hard time with TLS and whatnot, but CURLing to an API isn't that big of a deal. I know sendgrid offers something like this as a freemium service, but free services sometimes don't work well. Is there a service that has a very limited, cheap plan but would still offer some support if needed?

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[–] • 1 pt

I'm interpolating requirements here a bit but if Arduino then these devices are probably running in untrusted networks? If in a trusted network you could always stand up a mail gateway for them with relay access ACL'ed to the specific hosts or networks.

I think any sort of REST API-as-mail-relay is probably going to require TLS as well.

[–] • 0 pt

More than likely it will require some sort of secure access, but I was hoping there would be a library pre-made for some sender, similar to what people have done for Telegram. Sendgrid has some stuff, but I'm not interested in using nodeJS or other cruft.

My goal is to have a device that is completely standalone and sits outside my network - either on someone else's and/or on my fallback cellular network - and checks to see if my network resolves, and tell me when it doesn't. I want as simple a device as possible, so having something like a postfix server running as a relay isn't my goal. It has to be able to recover from a hard power cut without intervention.