Never said to re-implement SMTP. Just stating that I've been on shared servers where PHP mail() blocks and had to job-out SMTP for responsiveness. If I've enc

Never said to re-implement SMTP. Just stating that I've been on shared servers where PHP mail() blocks and had to job-out SMTP for responsiveness. If I've encountered it, I'm sure others have as well. As for the jobber, it was using the same PHP mail() function, it's just that the jobber runs async and does not have a time limit imposed on it. If you have control over your php.ini to where you can set agent parameters to be non-blocking, then yes, that would be ideal.