Swapped out a critical mail deliver/relay server that was Debian 12 for Debian 13 this morning. Built fresh system, Installed Postfix and OpenDKIM. Copied Postfix and OpenDKIM configs and swapped IP's with the old one at the data center. All of the SPF and other records stay the same this way. Been watching logs and all is good. The "big guys" are accepting email. Thanks Debian for clean stable system installs and sane configs. #debian13