CIVICRM-1558 Add sections, Email alerts for Events, Memberships, Contributions...

CIVICRM-1558 Add sections, Email alerts for Events, Memberships, Contributions and add warning about bouncing receipt CC/BCC fields

docs/contributions/online-contributions.md

@@ -207,6 +207,23 @@ Thank-you and Receipt emails that are sent to contributors.
     recommended to enable the automatic Email Receipt.
 4.  Click **Save and Done**.
 
+#### Email alerts for contributions
+
+Add one or more staff emails to the **CC Receipt To** or
+**BCC Receipt To** fields if you want real-time updates on who
+has processed a contribution. Enter one or more email addresses
+separated by comma.
+
+!!! warning
+    Make sure that the email addresses entered into the **CC Receipt To**
+    and **BCC Receipt To** fields are **correct and do not bounce**
+    or return an error email. Any return emails received by CiviCRM will be
+    interpreted as a bounce for the CiviCRM Contact that the receipt
+    was sent too and not as a bounce for the CC/BCC email address.
+    This can have the adverse impact that the CiviCRM Contact's email
+    address is put **On Hold** and **cause future emails to not be sent**.
+    [For more details see this issue report](https://lab.civicrm.org/dev/core/-/issues/1999). 
+
 ## Publicizing your contribution page
 
 Now that you've created your contribution page, it's time to bring

docs/events/online-event-registration.md

@@ -175,10 +175,7 @@ payment is processed between the Confirmation and Thank you pages.
 For most events you'll want to enable the Send Confirmation Email
 feature (see following screenshot). For paid events, the confirmation
 email also acts as a receipt. Make sure that the **Confirm From Email**
-address entered is a valid email account on your mail server. Add one or
-more staff emails (separating multiple email addresses with commas) to
-the **CC Confirmation To** field if you want real-time updates on who is
-registering for your event.
+address entered is a valid email account on your mail server.
 
 ![screenshot](../img/CiviCRM_update-CiviEvent-OnlineRegEmail-en.png "OnlineRegEmail")
 
@@ -186,6 +183,23 @@ Please note that the contents of the **Text** field will be included in
 both TEXT and HTML versions of receipt emails so we do not recommend
 including HTML tags / formatting here.
 
+#### Email alerts for event registrations
+
+Add one or more staff emails to the **CC Confirmation To** or
+**BCC Confirmation To** fields if you want real-time updates on who
+is registering for your event. Enter one or more email addresses
+separated by comma.
+
+!!! warning
+    Make sure that the email addresses entered into the **CC Receipt To**
+    and **BCC Receipt To** fields are **correct and do not bounce**
+    or return an error email. Any return emails received by CiviCRM will be
+    interpreted as a bounce for the CiviCRM Contact that the receipt
+    was sent too and not as a bounce for the CC/BCC email address.
+    This can have the adverse impact that the CiviCRM Contact's email
+    address is put **On Hold** and **cause future emails to not be sent**.
+    [For more details see this issue report](https://lab.civicrm.org/dev/core/-/issues/1999). 
+
 ## Optional event registration features
 
 The following features may be useful to enhance your online event

docs/membership/online-membership-sign-up.md

@@ -158,16 +158,28 @@ that gets added to the membership receipt on this page, and the email
 address that the receipt will come from. If you want to further
 customise the receipt email template you can do so using the **Mailings > Message templates** screen.
 
-You may also want to CC or BCC every membership receipt to a staff
-member so they are alerted immediately every time someone becomes a
-member.
-
 ![image](../img/membership_page_receipt_1.png)
 
 ![image](../img/membership_page_receipt_2.png)
 
-### The Tell-A-Friend tab
+#### Email alerts for memberships
+
+Add one or more staff emails to the **CC Receipt To** or
+**BCC Receipt To** fields if you want real-time updates on who
+has processed a membership. Enter one or more email addresses
+separated by comma.
 
+!!! warning
+    Make sure that the email addresses entered into the **CC Receipt To**
+    and **BCC Receipt To** fields are **correct and do not bounce**
+    or return an error email. Any return emails received by CiviCRM will be
+    interpreted as a bounce for the CiviCRM Contact that the receipt
+    was sent too and not as a bounce for the CC/BCC email address.
+    This can have the adverse impact that the CiviCRM Contact's email
+    address is put **On Hold** and **cause future emails to not be sent**.
+    [For more details see this issue report](https://lab.civicrm.org/dev/core/-/issues/1999). 
+
+### The Tell-A-Friend tab
 
 CiviCRM allows you to add a tell-a-friend feature to the thank-you page.
 The page lets your members share details about your organization with