Summary

Sharing a single issue from within JIRA the email address of the user that has shared the issue is being displayed in the "From" field.
In contrast, when sharing the results of filter query, the outgoing mail server "From" field is being used.
This behaviour is unexpected and inconsistent. Whenever a notification is being triggered from within JIRA, the outgoing mail server "From" field should be used.
It appears this behaviour is also showing when inviting a new user to JIRA, where the initiator is used instead of the outgoing mail "From" setting.

Steps to Reproduce

1. Open an Issue in JIRA, and use the share button to share the issue with another user
2. Create a filter query, and share the results of it with another user

Expected Results

In both cases, the "From" address should be set as defined under the outgoing mail server configuration

Actual Results

1. The filter result share uses the address of the user sharing the issue in the "From" field
2. The single issue share uses the outgoing mail server "From" address

Notes

The mail headers will display the information as follows:
When sending a filter result:

From: "admin (JIRA)" <outgoing mail server address>
X-Google-Original-From: "admin (JIRA)" <user email address>

When sending a single issue:

From: "admin (JIRA)" <outgoing mail server address>
X-Google-Original-From: "admin (JIRA)" <From address as configured under the outgoing mail server>

This has been tested with Gmail.
Certain mail servers/clients will only accept the "Original-From"