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+# Context
+E-mail worker in workspace `email-server` has the following task:
+
+- send e-mail verficiation requests
+- send rent due notifications
+- send utility bills due notifications
+
+The worker runs every 60 seconds (can be modified via env variable).
+During each run it checks which e-mails it needs to send, composes approrpate e-mail text and sends them.
+
+## Standoff strategy & Priority
+For each run there's budget which limits on total number of e-mails which can be sent in one go. This provides a stand-off so that the remote mail server is not overwhelmed. Default budget is 10, which can be configured via env variable.
+
+E-mail verficiation request have priority and are sent first.
+
+## Web App
+
+This worker is a companion to the web app in workspace `web-app`. It connects to the same DB and uses same data structures.
+
+In this document we use typescript types which can be found in /home/kneecola/projects/evidencija-rezija/web-app/app/lib/db-types.ts
+
+## Sending e-mail verficiation requests
+
+The process of sending e-mail verification requests is as follows:
+
+- connect to MongoDB (see how web app in `web-app` workspace connects to the DB)
+- fetch all `BillingLocations` from `lokacije` collection (see `locationActions.ts` in `web-app` workspace) - filter only records which satisfy the following:
+    - `yearMonth.year` and `yearMonth.month` equal to current year and month
+    - `tenantEmailStatus` is equal to `EmailStatus.Unverified`
+- for each record found
+    - check the e-mail budget counter
+        -> if the value is 0 then exit
+    - compile an e-mail containing the content listed below
+    - send the e-mail
+    - set `tenantEmailStatus` to `EmailStatus.VerificationPending`
+    - decrement the e-mail budget counter
+
+### Verficiation requests E-mail content
+
+```html
+<p>Hello ${tenantName}!</p>
+
+<p>You have received this e-mail because your landloard <strong>${userSettings.ownerName}</strong> wants to send you rent and utility bills invoices via rezije.app</p>
+
+<p><strong>rezije.app</strong> is an online app which helps proprty owners to manage expenses related to properties they lease.</p>
+
+<p>Before the app can start sending you rent due and utility bills emails we need your verification.</p>
+
+<p>To verify that you want to receive these notifications please click on the following link: <a href="https://rezije.app/email/verify/${shareId}">Verify</a></p>
+
+<p>You can ignore this email if you don't want to receive notifications. You can also unsubscribe at any time using the link included in every notification email you receive.</p>
+
+<p>Thank you!</p>
+
+<a href="https://rezije.app" target="_blank">rezije.app</a>
+```
+
+The `shareId` is generated using algorithm found in `/home/kneecola/projects/evidencija-rezija/web-app/app/lib/shareChecksum.ts`.
+
+# Sending rent due notifications
+
+The process of sending rent-due e-mail notifications is as follows:
+
+- check the e-mail budget counter
+    -> if the value is 0 then exit
+- connect to MongoDB (see how web app in `web-app` workspace connects to the DB)
+- fetch all `BillingLocations` from `lokacije` collection (see `locationActions.ts` in `web-app` workspace) - filter only records which satisfy the following:
+    - `yearMonth.year` and `yearMonth.month` equal to current year and month
+    - `rentDueNotificationEnabled === true`
+    - `rentDueDay` = current day (1-31)
+    - `rentDueNotificationStatus` === undefined OR `rentDueNotificationStatus` === null
+- for each record found
+    - check the e-mail budget counter
+        -> if the value is 0 then exit
+    - compile an e-mail containing the content listed below
+    - send the e-mail
+    - set `rentDueNotificationStatus` to `sent`
+    - decrement the e-mail budget counter
+
+### Rent due notifications E-mail content
+
+```html
+<p>Hello ${location.tenantName}!</p>
+
+<p>Your rent for the apartment ${location.name} is due today.</p>
+
+<p>For details and payment options please click the following link: <a href="https://rezije.app/share/location/rent/${shareId}">Rent details</a></p>
+
+<p>Thank you!</p>
+
+<p><a href="https://rezije.app" target="_blank">rezije.app</a></p>
+
+<p style="font-size:.7em">If you do no longer want to receive these notifications please click the following link: <a href="https://rezije.app/email/unsubscribe/${shareId}">Rent details</a></p>
+```
+
+# Sending utility bills due notifications
+
+The process of sending rent-due e-mail notifications is as follows:
+
+- check the e-mail budget counter
+    -> if the value is 0 then exit
+- connect to MongoDB (see how web app in `web-app` workspace connects to the DB)
+- fetch all `BillingLocations` from `lokacije` collection (see `locationActions.ts` in `web-app` workspace) - filter only records which satisfy the following:
+    - `yearMonth.year` and `yearMonth.month` equal to current year and month
+    - `billFwdEnabled === true` 
+    - `billFwdStatus === 'pending'`
+- for each record found
+    - check the e-mail budget counter
+        -> if the value is 0 then exit
+    - compile an e-mail containing the content listed below
+    - send the e-mail
+    - set `billFwdStatus` to `sent`
+    - decrement the e-mail budget counter
+
+### Verficiation requests E-mail content
+
+```html
+<p>Hello ${location.tenantName}!</p>
+
+<p>Your utitlity bills for the apartment ${location.name} are due today.</p>
+
+<p>For details and payment options please click the following link: <a href="https://rezije.app/share/location/bills/${shareId}">Utility Bills</a></p>
+
+<p>Thank you!</p>
+
+<p><a href="https://rezije.app" target="_blank">rezije.app</a></p>
+
+<p style="font-size:.7em">If you do no longer want to receive these notifications please click the following link: <a href="https://rezije.app/email/unsubscribe/${shareId}">Rent details</a></p>
+```