Email notifications are not being sent to certain group members

[Navaneeth1]

Certain group members have an outdated email address on the dev instance. We moved the groups, and user_has_roles XML files from dev instance to testing. The same user accounts exist in both dev instance and testing instance however, the testing instance has the latest email addresses of all users. These same users are now part of the groups that were moved but has the latest emails when we open the user forms.
The users who have different emails in dev and testing env are not receiving any emails that are part of their groups, the system tried to send it to their old email addresses even their user info has the new address. But the members of the group that has the same email addresses on both instances are recieving the emails. 

I checked each memeber in the groups on the testing instance and their email is correct. I moved the groups, group roles, and user_has_roles from dev to testing. Can someone please let me know what could've went wrong or if anyone has went through something similar?

Thank you!

[Sonam_Tiwari]

@Navaneeth1 , I believe, the new addresses should be part of group DL. 

I think the old ones with same email addresses across are receiving it because, their email address are part of existing group DLs.

[Navaneeth1]

Could you please let me know how I can see the DL of the group and how those changes can be reflected when we move from one instance to another?

[Sonam_Tiwari]

I meant if the new address is part of group email address or not. Can you also check if 'Include Members' is set to true on group record?

[Navaneeth1]

@Sonam_Tiwari ,

Include members is set to false. (Could you please let me know what this does and how it could be affecting my case)  The new address will be a part of the group email address if the group member has the new email address right? I don't see a dedicated field for just the list of email addresses for the groups. It just sends the emails to the group members user email which refers to sys_user list. 

[Sonam_Tiwari]

'Include Members' checkbox is the driver behind it actually.

This checkbox allows you to choose whether the group members should receive individual emails or not when an email is sent to group email address

Set it to true and try again once.