05396b6984
Bug fixes: - Fix integer expression errors by sanitizing grep output - Separate IMAP/POP3 authentication from email delivery events - Prevent login failures from being counted as email bounces New tracking features: - Spam rejections (SpamAssassin) - Greylisting events - Emails received count - Authentication activity (successful/failed logins) - Failed login IPs extraction - Top 5 senders and recipients - Email account existence check - Mailbox size and message count - Quota information - Email forwarder detection Enhanced recommendations: - Spam rejection troubleshooting - Greylisting explanation - Account not found guidance - Failed login attempt handling