How to find the source of exceeded Outgoing Mail Control limits via Plesk interface?
Plesk does not have such functionality at the moment.
As a workaround:
1. Locate the domain with exceeded limits, open Tools & Settings > Outgoing Mail Control > Domains
2. (Linux) Locate mail addresses exceeded the limits, open Tools & Settings > Outgoing Mail Control > Email Addresses.
3. Locate the mail sending attempts for the located email account, look into SMTP service log file:
- For Windows, it is in MailEnable console: Servers > SMTP > Logging > Activity
- For Linux, it is: