# SendGrid

**URL:** https://techoforum.com/c/email-marketing/sendgrid/31.md

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## [About the SendGrid category](https://techoforum.com/t/about-the-sendgrid-category/79)

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**Author:** [@admin](https://techoforum.com/u/admin)\
**Replies:** 0

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Discussion on SendGrid newsletter application.

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## [SendGrid Authentication Error](https://techoforum.com/t/sendgrid-authentication-error/80)

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**Author:** [@Jay](https://techoforum.com/u/Jay)\
**Replies:** 1\
**Last updated:** [October 4, 2022, 3:24pm UTC](https://techoforum.com/t/sendgrid-authentication-error/80 "2022-10-04T15:24:55Z")

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I’m on SendGrid’s free tier. It has been working fine till few hours ago but stopped working now. It is showing authentication error. I’m not sure if I’ve exceeded their 100 emails/day quota or something else is wrong? H…