Bounceback received on outbound relay. SMTP error message: "delivery temporarily suspended: connect to [XXX.XXX.XXX.XXX]:25: Connection timed out.
Posted by Andrew Smith on 10/03/16 14:16

The bounceback is required to investigate the logs of the destination SMTP server. Problems of this nature are usually a poor quality SMTP server, a broken firewall or router in place between our servers and the destination server (dropping ICMP packets, for example), or improper MTU configuration on the destination server/network. You can view this information via the outbound logs or via the bounceback email received

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