Is welcome followed by a comma?

I'm curious about the proper usage of punctuation in this context. Specifically, I'm wondering if it's appropriate to include a comma after the word "welcome" when it's used as a greeting. For instance, in a formal email or letter, would it be more appropriate to write "Welcome, to our company" or simply "Welcome to our company"? I understand that punctuation can vary depending on the context and style, but I'm looking for a general rule of thumb to follow. Can you provide some guidance on this matter?