It is common for MantisBT admins to report that they are having issues with users not receiving emails sent out by MantisBT. There are several reasons for this to happen:
- Emails landing in the recipient’s spam / junk folder
- Emails being rejected by the recipient’s email provider (these are lost).
- Emails being queued in MantisBT due to inability to connect or transfer messages to selected smtp server due to reaching daily quota limit (these are queued in MantisBT for future retries).