# \#error-501 **URL:** https://community.synatic.com/tag/error-501/60.md [Latest](https://community.synatic.com/latest.md) · [Categories](https://community.synatic.com/categories.md) · [Tags](https://community.synatic.com/tags.md) --- ## [Email error with Mimecast: 501 - Invalid Email Address](https://community.synatic.com/t/email-error-with-mimecast-501-invalid-email-address/115)
**Author:** [@shaun](https://community.synatic.com/u/shaun)\ **Replies:** 0\ **Last updated:** [May 28, 2021, 1:09pm UTC](https://community.synatic.com/t/email-error-with-mimecast-501-invalid-email-address/115 "2021-05-28T13:09:29Z")
Mimecast can block an email delivery with the following error: Error 501: Invalid Email Address. This implies that either the email address does not exist, or, the structure of the email address contains characters tha…