---- dataentry configoptions ----
type     : constant
name     : PHPMAILERSUBSCRIBEHOST
purpose  : SMTP host for sending messages that originate from the subscribe pages
allowed  : a valid FQDN of the SMTP host
default  : PHPMAILERHOST
status_s : 
category : system
----

Apart from the hostname, you can also specify the port and multiple hostnames

See [[system:sending#multi_smtp|Multi SMTP]]