IP address ranges for incoming and outgoing emails

This article describes which IP address ranges are used for sending and receiving e-mails via creoline E-Mail Protection.

This article was last updated on 16.11.2023.

IP address ranges for incoming e-mails

The following IP address ranges are used for incoming e-mails:

address range	protocol
5.1.77.49/32	IPv4
5.1.78.4/32	IPv4
5.1.77.50/32	IPv4
5.1.77.51/32	IPv4
5.1.77.52/32	IPv4
5.1.77.53/32	IPv4
5.1.77.54/32	IPv4
5.1.77.55/32	IPv4
5.1.77.56/32	IPv4
5.1.77.57/32	IPv4
5.1.77.58/32	IPv4
5.1.77.59/32	IPv4
49.12.130.5/32	IPv4
5.1.73.224/27	IPv4
2a07:6fc0:0:2::49	IPv6
2a07:6fc0:0:2::4	IPv6
2a07:6fc0:0:2::50	IPv6
2a07:6fc0:0:2::51	IPv6
2a07:6fc0:0:2::52	IPv6
2a07:6fc0:0:2::/64	IPv6

Attention:
When using a firewall for incoming traffic, the above IP address ranges must be enabled for incoming TCP connections on port 25.

IP address ranges for outgoing e-mails (send connector)

The following IP address ranges are used for outgoing e-mails:

address range	protocol
5.1.77.49/32	IPv4
5.1.78.4/32	IPv4
5.1.77.50/32	IPv4
5.1.77.51/32	IPv4
5.1.77.52/32	IPv4
49.12.130.5/32	IPv4
5.1.73.224/27	IPv4
2a07:6fc0:0:2::49	IPv6
2a07:6fc0:0:2::4	IPv6
2a07:6fc0:0:2::50	IPv6
2a07:6fc0:0:2::51	IPv6
2a07:6fc0:0:2::52	IPv6
2a07:6fc0:0:2::/64	IPv6
2a07:6fc0:1::73:0:0/120	IPv6

IP address ranges for delivery via SMTP (SMTP server)

address range	protocol
5.1.77.15/32	IPv4
5.1.73.222/32	IPv4
5.1.73.223/32	IPv4

Attention:
When using a firewall for outgoing traffic, the above IP address ranges for outgoing TCP connections must be enabled on port 465 (SSL/TLS) and port 587 (STARTTLS).