SEPPmail Cloud CH instance: additional IP ranges

The extension setup of SEPPmail Cloud CH instance is about to go live. With new high performance servers we are ready for future growth. In mid September traffic will start with a few selected NFR partner domains, before gradually going into production with all customers once the new IP addresses have warmed up sufficiently.

The oncoming changes should have no influence on customer experience. However, we advise to perform a few checks to ensure mail flow is not affected by configurations tightened to only the current IP addresses of SEPPmail Cloud.
For all M365 customers: check that certificate based connectors are used to receive mail (this is the case if you used the Powershell-module to create the configuration).
For all other mailhostings: no firewall rules should block mail traffic to and from our IP ranges. Please ensure traffic to and from 86.119.112.0/28 and 2001:620:6:e0b0::/64 are permitted.
Inline outbound customers: ensure SPF include _spf.ch.seppmail.cloud is used.

Manual intervention on customer side should only be required if:
SPF record was built manually instead of using our include. In such case please add the new IP ranges.
IP based connectors or firewall restrictions. In such case either allow all our IP ranges to connect to Port 25.

Inline customer’s outgoing mail will be sent via 86.119.87.123 and 2001:620:6:e0b0::58 instead of 86.119.38.33 and 2001:620:5ca1:1f0:f816:3eff:fef0:1d65
Parallel customer’s incoming and outgoing mail will be sent via 86.119.88.140 instead of 86.119.37.4.
No manual intervention on customer side should be necessary unless some firewall restrictions would prevent access to port 25 of those IP addresses.

Inline customers MX records IP addresses will be updated to 86.119.88.191 and 2001:620:6:e0b0::35 from 86.119.35.35 and 2001:620:5ca1:1f0:f816:3eff:fe96:d78e. No action of any kind should be required on customer side.

All previous IP addresses and ranges remain active for the moment. Customers of DE instance are not affected in any way. Our IP addresses are published in https://docs.seppmail.com/ch/cloud/c07_cloud_onboarding_appendix_ip_addresses.html