I need to use the spool option to send massive emails to my users, but i won't to change whole config of my app to spool because my register system send an email to the user and i want that this email be instant send.
Is any way to do this without change the global config for swiftmailer?
You can configure different emailers. For example:
Then use one emailer or the other depending on whether you want to spool or not: