-A INPUT -p tcp --dport 22 -j ACCEPT
# HTTP; uncomment for creating LetsEncrypt certificates in standalone mode.
#-A INPUT -p tcp --dport 80 -j ACCEPT
-# SMTP (allowing for STARTTLS); necessary for mail server to mail server banter
# HTTPS in theory, in practice my second SSH port, see sshd_config
-A INPUT -p tcp --dport 443 -j ACCEPT
# SMTP (allowing for STARTTLS); necessary for mail server to mail server banter