exclamista 

A person, usually but not always female, who uses the lowly and once-derided exclamation point indiscriminately, frequently in e-mails that begin "Hello!" or some such inanity.

He silently categorized the candidate as an Exclamista, having read her ingenious cover letter -- which, like many, began "Dear Sir!"; he would hire this hottie regardless, resigning himself to years of e-mails beginning "Thank you for the update!".

exclamista by Nightstalker April 4, 2009

exclamatate 

to cry out with enthusiasm in an animated fashion

Everyone turned to look at Devin as she yelled out her college acceptance letter and broke out into an exclamatated happy dance.

exclamatate by 912savannah May 12, 2013

Exclaminator

A person who over uses exclamation marks in all forms of writing.

An example of a text from an Exclaminator.

Hi! I was just thinking about you! So excited to see you on the weekend! Look forward to catching up! It's been too long! Lots of love!

Exclaminator by Grammar matters November 23, 2020

Exclamitorily 

to say something with exclamation, but the phrase was not mainly an exclamation

"You have such magnificent eyes" Daniel remarked exclamitorily.

Exclamitorily by Pixeldevil February 21, 2020