Question Sir or Mam

[Unregistered]

Will you please tell me if this is correct grammer, or someone's thought of correct grammer?

"I like to check my e-mail of a morning if i have no prior engagements."

Key words being "of a morning" in place of "in the morning"

Is this grammatically acceptable?

Thank You,
Joe V.

[Tdol]

It is, but the phrase may seem a bit old-fashioned to some people.