This is great, click here
I use it in my secretarial role for a club as I had exactly the same problem as you.
You add all the email addresses and can then use mailmerge so everyone gets their own message. You can add attachments as well. The support is good too, I had a really rapid response to my questions. I find it very simple and effective. You can also set it up to use multiple addresses for sending emails, so you could have one for yourself and one for the churh.
There are various levels of 'credits' included in a reasonable monthly payment and you can buy extra credits if you need them. Jst remember that, as they are based in Belgium, the vat rate is higher than ours!
Give it a try and see what you think. I'm not connected with YMLP, but it was suggested by someone on this site when I too was looking for a solution.