# E-mail notification problems to Gmail

**URL:** https://forum.duplicati.com/t/e-mail-notification-problems-to-gmail/2904
**Category:** Support
**Created:** [March 15, 2018, 11:17am UTC](https://forum.duplicati.com/t/e-mail-notification-problems-to-gmail/2904 "2018-03-15T11:17:14Z")
**Posts on this page:** 1
**Showing post:** 9

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### Author: ![JonMikelV](https://forum.duplicati.com/letter_avatar_proxy/v4/letter/j/439d5e/32.png) [@JonMikelV](https://forum.duplicati.com/u/JonMikelV)
#### Post date: [March 23, 2018, 4:12pm UTC](https://forum.duplicati.com/t/e-mail-notification-problems-to-gmail/2904/9 "2018-03-23T16:12:38Z")

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> [@jamesfreeman959](#):
>
> Where should I look next to resolve this?

Certain versions of mono came with an empty certificate store - perhaps yours is empty or stale?

- `cert-sync /etc/ssl/certs/ca-certificates.crt` #for Debian based systems - `cert-sync /etc/pki/tls/certs/ca-bundle.crt` #for RedHat derivatives

> [@Error in Updater](https://forum.duplicati.com/t/error-in-updater/502/4):
>
> Got it - I have an Ubuntu VM sitting around, I’ll see if I can replicate the problem. Just out of curiosity is it actually working OK even though it’s logging that error? And to what destination type are you pointing (S3, SFTP, WebDAV, etc.)? My uneducated GUESS is that the issue is related to certificates. Windows ships with a bunch of Root and Intermediate Certificate Authorities (CA) which I believe are kept fresh with Windows Update. Unfortunately, it appears Mono’s certificate store is…

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