Does SF recruiting send out bulk emails?

SGT (Join to see) I'll let the cat out of the bag. There are 2 ways of conducting email prospecting by the SORB.
#1 a Team of civilians at USAREC send out normal mass blasts to anyone within pay grade standards. Pretty standard, that's what the one you received looks like.
#2 The recruiters ourselves sort through the system to find fully qualified personnel including Rank, Time in Service/Grade, GT Score, location, ETC... many different qualities that help us filter down to the exact person within our market.
I cover 7 states, the guys at USAREC cover the entire world. So I don't want to email those outside my area so I tailor down the mass email, as well as make it more personable and actually explain some of the job, rather than just "contact your local SORB"

So yes, we do use mass emails to assist in ARSOF Recruiting. But just because it is a mass email does not mean it doesn't mean anything, it simply alerts Soldiers that there is an opportunity and that you don't have to be an 11B to try out.

As for your other posts. Just because SF is down on numbers doesn't mean the attrition rate is different. A standard is a standard.
My advice is to head over to the Office on Bragg (by Tucker Gym) and talk to the CA, PO, and SF recruiters to find out which SOF branch is best for you. As in which one you like the best based on how it relates to you and what you think you'd be best at. Many Soldiers aren't cut out for SF but are great for CA, and many are far from cut out for CA but should do well in SF. None are better than the other, they do different stuff, and you need all three working together to conduct an effective Unconventional Warfare operation.

You have met the basic criteria to be considered

Sounds like Pishing

They sure do. If your test scores meet the standard then you can expect that email every now and then.

You'll get lots of those, and not just from SORB but from various SMUs throughout your career, up until you're selected for E7. You meet basic criteria to apply, that's all it means.

As a SORB Company Commander I sent the mail merge myself many times, for both enlisted and officers.

Just means that you met the basics for consideration. You fall within the MOS range they are looking at, the age and enlisted range as well as other factors. If in doubt, reach out and contact someone. There should be a name, number as well posting listed on the mail.

Yeah it’s a mass email

When I got one of those I laughed, because while I certainly could serve as a SF chaplain, I can't branch transfer from 56A to 18A.