Email-Trouble-Shooting

• 1. Because the sender wrong email address In his email address book. (some character can only see by computer)
• 2. The sender DNS has not update new ip address after the domain name removal to a new ip address. (tracert to compare) netstat -tl
  nslookup -q=mx gmail.com
• 3. Email Account Over Quota.
• 4. Some attachment is danger e.g. exe or have virus. 
• 5. Some email go into rubbish bin.
• 6. Harddisk not enough space.
• 7. rec'd email box too many email, the speed too slow.
• 8. Traffic Jam in Local Lan (Some station had virus)
• 9. Traffic Jam in internet. (eg. email to 126.com from HK to PRC)
• 10. Email Have not forward to this account.
• 11. Send to boss (e.g. through SMTP to forward) , not function, because sender use another email account.
• 12. Hub problem
• 13. data wire problem (Broken, or electric jam)
• 14. firewall problem
• 15. domain name expired
• 16. Virus
• 17. The email subject like virus jam email subject.
• 18. Email Policy filing to anonther folder.
• 19. ISP wrong setting in ISP company DNS.
• 20. The email tile is very common. e.g. Hello
• 21. The email not display the content. Check the harddisk space
• 22. Cannot Rec email from gmail.pop3 becuase gmail put them into spam.
• 23. 553 dns.domainName.com config error: mail loops back to me (MX problem?), 554 ... Local configuration error, (reason: 501 5.1.8 ... Domain of sender address UserName@DomainName.com does not exist) (reason: 451 4.3.0 lockmailbox /var/mail/kstsai failed; error code 75 ) nslookup -q=mx domain.com
• 24  ps -ax | grep sendmail
• 25 email a lnk file to receiver