Yes, however, we generally send emails all the time, some automated, some manually, but nearly all are regular sends.
So it's important to clarify that you're sending an email to a group of subscribers that is a one off, it doesn't need to be sent again the same day next week or month with slightly different words or pictures.
Solus is not the correct way of writing that succinctly.
does the person have English as a second language? maybe their first language uses solus more often, and as it's Latin, they assumed it was globally understood?
Yes, however, we generally send emails all the time, some automated, some manually, but nearly all are regular sends.
So it's important to clarify that you're sending an email to a group of subscribers that is a one off, it doesn't need to be sent again the same day next week or month with slightly different words or pictures.
Solus is not the correct way of writing that succinctly.