update README

README.md

@@ -109,6 +109,8 @@ Using this playbook, you can get the following services configured on your serve
 
 - (optional) [honoroit](https://gitlab.com/etke.cc/honoroit) helpdesk bot - see [docs/configuring-playbook-bot-honoroit.md](docs/configuring-playbook-bot-honoroit.md) for setup documentation
 
+- (optional) [postmoogle](https://gitlab.com/etke.cc/postmoogle) email to matrix bot - see [docs/configuring-playbook-bot-postmoogle.md](docs/configuring-playbook-bot-postmoogle.md) for setup documentation
+
 - (optional) [Go-NEB](https://github.com/matrix-org/go-neb) multi functional bot written in Go - see [docs/configuring-playbook-bot-go-neb.md](docs/configuring-playbook-bot-go-neb.md) for setup documentation
 
 - (optional) [Mjolnir](https://github.com/matrix-org/mjolnir), a moderation tool for Matrix - see [docs/configuring-playbook-bot-mjolnir.md](docs/configuring-playbook-bot-mjolnir.md) for setup documentation