> For the complete documentation index, see [llms.txt](https://docs.acymailing.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.acymailing.com/faq.md).

# FAQ

- [Could not instantiate mail function - AcyMailing](https://docs.acymailing.com/faq/could-not-instantiate-mail-function.md): A common error but a difficult one to fix without help. Learn how to do it in this article.
- [Spam issue](https://docs.acymailing.com/faq/spam-issue.md): If your emails end up in the spam folder of users that subscribed to your newsletter, these things could help you improve the deliverability.
- [Your send process is slow?](https://docs.acymailing.com/faq/your-send-process-is-slow.md): Here are the things you can improve in order to speed up your send process
- [Compatibility issues](https://docs.acymailing.com/faq/compatibility-issues.md): You will hopefully find here solutions for the most obscure issues that could happen using AcyMailing
- [Mail archive not displaying special characters](https://docs.acymailing.com/faq/mail-archive-not-displaying-special-characters.md): Issue that can happen after version 8.6.0