Message Filtering at UM . The good, the bad & the ugly. Overview . History Message flows & filtering points Common mail flow errors & diagnostics Efficient Troubleshooting Tips & Gotchas Future. History. Antigen for anti-virus since 1999 “ORF” for blocking & stats since 2003
The good, the bad & the ugly
Mis-foldered msgs: Spam in the inbox and/or ‘good mail’ in the Junk Mail Folder
Check for the Ironport stamp within the headers
Check for custom user-created rules.
Report if appropriate, be aware of the 0.1 % failure rate of the IMFTune ‘foldering’ engine.
This email message is to notify you that your membership to 52-discusswas previously "held" and has now been restored to "normal".This means that you were not receiving mail from '52-discuss'.Your subscription was held because your email address was bouncing alarge amount of mail which was sent to it.Your membership has now been restored to "normal", and the listserver program running '52-discuss' will attempt to send you mail. Ifyour email address continues to bounce mail, your subscription willonce again be "held".You may want to contact the people responsible for your electronicmail to determine why your email address has been refusing mail.
Dramatically fewer ‘false-positive’ blocks with the new Ironports
But more difficult to resolve.
May not be able to track lost mail via sender’s email address alone.
‘Source IP’ of the sending mail system is the key to resolving issues.
Check the internet header info of any previously successfully received messages.
Have sender forward any error messages to [email protected] , or to recipient via alternative mail system.
Be patient, if the sending system is normally ‘clean’, the Ironports will eventually allow the traffic to flow in.
Google the recipient’s last name <space> & domain and/or “specialty” to find new email addresses…
smith@ swine genetics DNA mailto:
Hello, I’ve been experiencing problems with my e-mails not going through to people. I get e-mails from them, but they do not receive mine. I talked to some other people in my department who say that their e-mail works fine. Have any ideas of what might be going on?
Advise sender to 'enable delivery & read receipts' with their outbound messages.
This will tell them whether the messages are being accepted by the remote mail server.
If problems continue, have them try very short, one line, test msgs - to see if they get thru.
If short test msgs get thru, but not other messages, then odds are strong that her messages are being filtered by the remote system.
Last resort = send a note to the postmaster & abuse accounts at the failing domains and ask that they check to see what happened to her messages...
This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
Don’t assume your folks couldn’t fall for these…
Messaging ‘explosion’ as handhelds take off, etc…
Content size increases as attachments get even larger.
Encryption & authentication becoming ever more important.
More security threats, & “better’ scams…