Bulk mail refers to the practice of sending large quantities of letters or advertisements to many people at once. It is often used by businesses or organizations to reach a wide audience efficiently and cost-effectively. Full definition
They're providing me with two different sets of bulk mail postcards every month, one for my sphere of influence and one for my farming area, just over 500 in all. (realtormag.realtor.org)
If you do not receive the email, check your junk mail / spam mail / bulk mail folder. (analsexualdating.com)
In this form that was sent via bulk mail... it didn't even have the correct place of employment listed! (getoutofdebt.org)