Having issue with auth email not sending

Hey this was all working but im now getting errors on my Auth endpoints.

Error 500
https://MYSITE.supabase.co/auth/v1/signup

response:
code: "unexpected_failure"
message: "Error sending confirmation email"

Im using Resend as my SMTP provider, it seems to send out emails ok from resend if I send a user an invite from Supabase auth, but if I use the api then I get an error. I also tried switching off my customer SMTP and going back to using Supabase SMTP but I still get the same error on the endpoint, any one got any ideas as I feel like its a Supabase bug

inder•7/29/25, 8:03 AM

have you checked auth logs in dashboard? There might some useful info in there

eyebonk (Alex)OP•7/29/25, 8:24 AM

I did but it didnt help. I think ive found it though, it doesnt like something with my custom email templates, I suspect a char count or something

eyebonk (Alex)OP•7/29/25, 11:12 AM

not sure if its the char count, or something in the email template it didnt like but putting the email markup back to a simple version seems to work.

inder•7/29/25, 11:15 AM

I think there must be some syntax error in the template. Verify that you're correctly using variables inside template. Most of the times thats the issue.

The variable should be like this
{{.VariableName}}{{.VariableName}}

eyebonk (Alex)OP•7/29/25, 11:33 AM

im using {{ .ConfirmationURL }}{{ .ConfirmationURL }} but yeah its in there

silentworks•7/29/25, 11:42 AM

Emails don't normally fail to send if the template has an issue as it normally just reverts to the default template.

Having issue with auth email not sending

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