Understanding Undeliverable Emails: Hard Bounce vs. Soft Bounce By CAS, Inc. | Central Address Systems Posted on November 1, 2016 Posted in Email, Hygiene Fatal error: Out of memory (allocated 642002944) (tried to allocate 17598960 bytes) in /homepages/39/d295633752/htdocs/blogcasonlinecom/wp-includes/wp-db.php on line 2033