devops
What's the difference between "daemon mode" and "mail-submission mode" in sendmail?
A quick walk-through of modes
sendmail
devops
What happens to active SMTP sessions during a sendmail daemon restart?
A deep-dive into smtp transaction behavior during sendmail restarts
devops
What are sendmail debug switches and how can they be used to troubleshoot deferred messages?
A guide describing the basics of sendmail debug switches and how to use them.