I have a small domain with multiple hosts. Sendmail is set up to forward all locally generated mail (mostly mail to
root@localhost generated by cron jobs) to a central "mail hub", using
sendmail.mc. Recently I had a problem with the mail server on the remote end, so that It would not accept mail from this host. This caused sendmail to drop all mail. From
sendmail: n4461S5s003133: n4461S5t003133: return to sender: Service unavailable sendmail: n4461S5t003133: to=root, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=34772, relay=XXXXX.org. [22.214.171.124], dsn=5.0.0, stat=Service unavailable sendmail: n4461S5s003133: Losing ./qfn4461S5s003133: savemail panic
All mails generated during this time were dropped and lost forever.
How can I prevent this? Ideally I'd like sendmail to try again laiter or eventually to save the mail to a local file as a last resort.