Comma After Conjunction in Introductory Clause
Introductory clauses frequently begin with a conjunction (although, since, when, if, etc.) There should be no comma after the conjunction in the introductory clause.
Because, it was going to rain, we cancelled the picnic.
The comma after because should be removed; the comma after rain is properly used as it separates the introductory clause from the independent clause.
After, flunking her Victorian Literature class, Martha decided to do the assigned reading.
When and if, it gets delivered, please bring the package into my office immediately.
So, that the water didn’t get in, we attached rubber seals around the windows.