Allow Canvastera email
Allow school mailboxes to receive account and invitation messages from no-reply@app.canvastera.com. The sending domain is app.canvastera.com and the configured outgoing mail server is smtp-01.redtag.studio.
If expected messages do not arrive, check spam folders, quarantine and the school mail gateway logs. Check the message headers when reviewing a delivery rule. Keep normal sender authentication checks enabled.
These settings concern incoming mail at the school. Students’ browsers use HTTPS to access Canvastera; school devices do not need an SMTP connection to our mail server.
The mail server’s DNS addresses were checked on 14 November 2026:
- IPv4:
78.46.133.181 - IPv6:
2a01:4f8:c013:5f11::1
Use these addresses only if your mail gateway needs them. Check current DNS records before adding an IP rule.
Allow website and media access
Allow outbound HTTPS on TCP port 443 to these domains:
- canvastera.com: website, sign-in, editor and poster viewer.
- www.canvastera.com: alternate website address.
- static.canvastera.com: application scripts, styles, fonts and public images.
- storage.canvastera.com: stored media used by posters.
Prefer domain-based rules. Asset and media services can use a CDN with changing addresses. Allowing only the main website IP is not sufficient for the editor and media to load.
The app.canvastera.com domain is used in the email sender address. Use https://canvastera.com to open the application.
If your firewall requires website IP addresses
The DNS addresses for canvastera.com were checked on 14 November 2026:
- IPv4:
128.140.30.73 - IPv6:
2a01:4f8:c01e:a3f::1
These are reference values, not permanent addresses. Check current A and AAAA records before applying rules. Account for IPv6 if the school network uses it. Keep domain rules for the asset and media services as well.
Check external content and payments
Posters can include content from external services, such as videos, maps and embedded documents. The required domains depend on the content teachers choose. Test the actual classroom poster and review blocked requests if an embed does not load.
Licence checkout uses Paddle. Test checkout on the device and network used to buy the licence. If it is blocked, review the payment requests with your IT team. The Canvastera domain list above covers the core application; it is not a complete list of external content or payment services.
Test with a teacher and a student
Use a school mailbox and a device on the same network students will use.
- Receive an invitation email from Canvastera.
- Open the invitation and sign in.
- Join the intended school group and class community.
- Create a poster with an account that has a group editing licence.
- Upload an image, save the poster and reopen it in the viewer.
- Play the external media used in the planned lesson.
For help, use Contact Canvastera. Include the blocked domain, the time of the failure and the action that failed. Do not send passwords or invitation codes.
When these checks pass, teachers can follow Set up Canvastera for your school. Students with existing accounts should read Join your school with an existing account before accepting a Student invitation.