How do you offer an email marketing service to an offline business?

What is involved is what you decide to make involved.

I think you should offer a service where you handle it for them.

As for what to charge. As always (What you are worth per hour) x (Estimated Hours) x (Flub factor - say 120%) + (costs - marked up) + (any base price you want figured in)

What aaron said above, plus factor in what yuour market would bear. Nail technician renting a chair wouldn't be able to afford 500pcm for newsletter service, I even seen £37pcm newslett service offers close down after a year of no takers.

Lawyer dentist have bigger budgets. Accountants as well. They need more professionally written newsletters, but still there is better profit margin.

I would say offer basic package - just set up.free incentiuve to signup plus first 6-7 messages sequence
Middle package - set up and manage, write newsletter monthly
Luxury package - trow in extra campaigns sequences.

You can vary packages by clients, but it's proven that most people go with middke package. When selling, you actually can say, that middle one is your most popular package, because....etc.

If you cannot write, outsource good quality, prepare to pay around 15-25 per nice article, don't go for cheap ones or PLR, unless heavily reworked.

Decide, what you need to do and are you willing to do it. If you just want to go and set it up for them without headache of providing content monthly - go ahead and advertise your starter service.

If you rather have residual income, advertise middle package.
If you are good with crafting campaigns with vouchers, qr codes etc - advertise your luxury package.

Hope that helps

Thanks all, good advice.

The very FIRST thing you need to think about is their list. Most offline businesses don't have one! But building their list can be quite easy, depending on their industry and is the first service you can sell them.