Hello,

We are running an internal Odoo instance on Odoo.sh (production) and we are trying to configure outbound email sending using Microsoft 365 SMTP Relay (recommended approach to keep Security Defaults enabled).

Our production environment outbound IP is:

34.42.xx.xx

This IP is currently listed on Spamhaus, which causes Exchange Online Protection to block all outgoing emails:

550 5.7.1 Service unavailable, Client host [34.42.xx.xx] blocked using Spamhaus

This makes it impossible to send emails reliably from Odoo using SMTP relay, even with a properly configured Exchange connector and SPF.

We would like to know:

1. Is it possible to obtain a clean / dedicated outbound IP for SMTP traffic on Odoo.sh?

2. If not, what is the officially recommended solution from Odoo for reliable outbound email delivery from Odoo.sh (ERP use case)?

3. Are there best practices or supported third-party SMTP services that you recommend for Odoo.sh customers in this situation?

Our constraints:

• Microsoft 365 Security Defaults must remain enabled

• No SMTP AUTH with user credentials

• Reliable email delivery is critical (ERP notifications, documents)

Thank you in advance for your guidance.